diff --git a/Cargo.lock b/Cargo.lock
index 52fce8e..6af7b11 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -69,6 +69,7 @@ dependencies = [
  "anyhow",
  "aoc",
  "itertools",
+ "nom",
 ]
 
 [[package]]
@@ -79,6 +80,12 @@ dependencies = [
  "criterion",
 ]
 
+[[package]]
+name = "arrayvec"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
+
 [[package]]
 name = "atty"
 version = "0.2.14"
@@ -102,6 +109,18 @@ version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 
+[[package]]
+name = "bitvec"
+version = "0.19.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a7ba35e9565969edb811639dbebfe34edc0368e472c5018474c8eb2543397f81"
+dependencies = [
+ "funty",
+ "radium",
+ "tap",
+ "wyz",
+]
+
 [[package]]
 name = "block-buffer"
 version = "0.7.3"
@@ -310,6 +329,12 @@ version = "1.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
 
+[[package]]
+name = "funty"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ba62103ce691c2fd80fbae2213dfdda9ce60804973ac6b6e97de818ea7f52c8"
+
 [[package]]
 name = "generic-array"
 version = "0.12.3"
@@ -364,6 +389,19 @@ version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
+[[package]]
+name = "lexical-core"
+version = "0.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db65c6da02e61f55dae90a0ae427b2a5f6b3e8db09f58d10efab23af92592616"
+dependencies = [
+ "arrayvec",
+ "bitflags",
+ "cfg-if 0.1.10",
+ "ryu",
+ "static_assertions",
+]
+
 [[package]]
 name = "libc"
 version = "0.2.81"
@@ -405,6 +443,18 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "nom"
+version = "6.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88034cfd6b4a0d54dd14f4a507eceee36c0b70e5a02236c4e4df571102be17f0"
+dependencies = [
+ "bitvec",
+ "lexical-core",
+ "memchr",
+ "version_check",
+]
+
 [[package]]
 name = "num-traits"
 version = "0.2.14"
@@ -466,6 +516,12 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "radium"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "941ba9d78d8e2f7ce474c015eea4d9c6d25b6a3327f9832ee29a4de27f91bbb8"
+
 [[package]]
 name = "rayon"
 version = "1.5.0"
@@ -598,6 +654,12 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "static_assertions"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
+
 [[package]]
 name = "syn"
 version = "1.0.54"
@@ -609,6 +671,12 @@ dependencies = [
  "unicode-xid",
 ]
 
+[[package]]
+name = "tap"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "36474e732d1affd3a6ed582781b3683df3d0563714c59c39591e8ff707cf078e"
+
 [[package]]
 name = "textwrap"
 version = "0.11.0"
@@ -646,6 +714,12 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
 
+[[package]]
+name = "version_check"
+version = "0.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5a972e5669d67ba988ce3dc826706fb0a8b01471c088cb0b6110b805cc36aed"
+
 [[package]]
 name = "walkdir"
 version = "2.3.1"
@@ -751,3 +825,9 @@ name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "wyz"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85e60b0d1b5f99db2556934e21937020776a5d31520bf169e851ac44e6420214"
diff --git a/aoc2020/Cargo.toml b/aoc2020/Cargo.toml
index a5e88e4..d1c3b99 100644
--- a/aoc2020/Cargo.toml
+++ b/aoc2020/Cargo.toml
@@ -10,6 +10,7 @@ edition = "2018"
 aoc = { path = "../aoc" }
 anyhow = "1.0"
 itertools = "0.9"
+nom = "6.0"
 
 [lib]
 path = "src/lib.rs"
diff --git a/aoc2020/input/day18.txt b/aoc2020/input/day18.txt
new file mode 100644
index 0000000..ed81407
--- /dev/null
+++ b/aoc2020/input/day18.txt
@@ -0,0 +1,373 @@
+5 + (6 + 3 + (4 + 7 * 3 + 6 + 4 + 2) * 9) * 7 + 7
+5 * 8 + 3 * ((5 + 9 * 9) * (3 * 5 + 7 * 2 * 3) + 3 * 6) + 8
+5 + 5 * (6 + 7) * 5 + 4 * (3 * 3 * 8 + 2)
+(6 + 2 + 9 + 9) * 6 + (2 + (5 * 3 + 4 * 5 * 8 + 5) + 6 + (5 + 9 * 8 + 2 + 2))
+3 + (5 * 4 * 6 + 5 * (9 + 7 * 9)) * 5 + ((2 + 8 * 2) * 6)
+3 * (9 + 9) * 4
+5 * 6 + ((2 + 8 * 5) + (5 * 7 + 4 * 9 + 2 + 3) + 5 * 4 * 5) * 4 * 4
+8 + 5 + 5 * ((9 + 9 * 2 * 3 + 3 * 9) + (7 * 4 + 2))
+((2 * 5 * 5 + 6) * 6) + 3 * 9 * (8 * 3 + 4) * 7 * (3 + 9 + 8 * (8 * 8 * 5) + 8 * 3)
+9 + (6 + (4 + 2 * 3 + 4) * 7 + 6 * 7) * 8 + 6
+6 * 9 * (9 * 9) + 5 + 8 + 9
+3 + 4 * 5 * 7 * ((3 + 9 * 9) + 2 + (5 + 3 + 5 + 2 + 8 + 4) * 6 * 6 + (2 * 5 * 8 * 6)) * (7 + 3 * 7 * 2 * 5 + 6)
+9 + 6 + 5 * 2 * (2 + 4 + 9 * 4)
+(2 * 4 * (9 + 8 + 8) + 6 * 2 + 8) + 4
+(5 + 4 * (9 + 2 * 2 + 6 * 9 * 5) * 5 * 7) + (6 * 8 + 7)
+3 + 8 * 4 + 2 + (7 * (7 * 5)) + 2
+3 + 4 * ((2 + 5 * 6) + 2 + 5 * 4 * (9 * 8 * 6 + 9) * (9 * 5 * 4 + 9 + 2)) + 6
+(6 * 4 + 2) * 7 * 6 * 5 * ((4 + 5 * 8) + 6 + 7) * 7
+(3 * 5 * 4 * 5 + 9) + 6 + 6 * (6 + 2 * 5 + 7 * 4)
+5 * ((5 + 3 + 6 + 9 + 7) + 5) * 6 * (9 + 9 * 3 + 4 + 3) * (5 * (3 * 5 * 2))
+9 * (8 * 9 * 2 + 2) * 7 * 9 * 7 + 4
+3 * 2 * 8 * 9 + 6 * ((5 + 8 + 2 + 2) * 7)
+7 * 7 * (5 * 8 + 9 * 2 + 8) + 3 + 2 + 5
+9 * 2 + (6 + 8 + (2 + 3 + 7 + 4 + 5 * 6) + 5 + 8)
+8 + (6 * 2 + 4 + 7 * 9) + 5 * ((7 * 6 * 6) * (9 + 8 * 2 * 8) + 9 + 8 * 5) * 2
+(5 + 5 + 6 + 6 * (4 + 9 * 3 + 8 + 5) * 2) + (6 + 6) * (7 * 2 * 8 + 2) + 8 * 3 + 4
+7 + 9 + ((9 * 5 + 6 * 6 * 6) * (6 + 7 + 8 * 7 * 4 + 6) + 8 + 4 + 9) + (9 + 3 * 4)
+5 + (9 + 4 * (7 + 4 * 5 + 5) + (6 + 8 * 7) + (8 + 2)) + 3 + 8 + (7 * 7 + 6 * 9 + 5)
+(3 * 5 * 8 * 9) + 9 * 3 * (5 + (4 * 7 * 7 + 5 * 7) * 8 * 5 + 4 + (3 * 5 + 4)) + 2 * 6
+((6 * 7 + 6) + 5 * 8 * (9 * 2 * 4)) * (4 + 6 + 3 * 9 + 7)
+3 + 5 * 5 + 8 + 9
+5 + (7 * (2 * 4 + 5 * 2 + 7 + 6) + 2 * 7) + 3 + 9 + (2 * 4 * 4)
+(5 + 6 * (6 + 9 * 2)) * 4 + 3 + 7 * 3
+9 * 5 * ((5 * 9 + 5 * 4) * 3 + 5 + 4 + 2) * 3 + 9
+7 + 7 * 9 * (7 * 3) * 5 * 8
+4 + (5 * 2 + 9 + 6) * 2 * 3 * 3
+9 * 9 * 5 * ((9 * 5 * 9 + 3 * 7 + 4) * 9 * 5) + 5 + 3
+(7 + 8 + (2 + 9 + 6 * 6 + 9 + 6)) + 6 * 7 + 9 + 9
+8 * (3 * 8 + 5 * 4 + 5 + (5 + 5 + 9)) + 9 * 5 * 4
+(6 + 5) + 9 * 2 * 8
+(8 * 5) + 6 * 6 * 6 * ((3 + 7 + 3) * 9)
+4 * (3 * 2 * 5 + (6 * 2) * (8 * 8 * 4 * 8 + 3 + 3) * 6) + 2 + 3 + 9 * 8
+((8 * 6 + 4 + 5 + 6 * 3) + (8 * 8 * 7) * 2 * 6 * 3 * 7) * (4 + 7 * 4) + 4 + 2 + 3 * 9
+7 * 4 + 5 + 3 + (4 * 3 + (6 * 8 * 5 * 5 + 4) + 9 * 3 * 8) * 9
+2 + (3 + 3 + 6 + 2) * 5
+9 + 8 + 9 + 4 * ((2 * 2 * 4 * 9 * 4) * (3 + 5 * 7 + 9) + (7 + 9 * 2 * 7 * 3) + 7)
+8 + 3 + 2 * (2 * (7 * 5))
+(8 + 5 * 8) * 8 + 4 * (3 * (5 * 3)) * 7
+(3 * 9) * 8 + (3 * (9 + 3 * 2 * 7 * 9) + 8 * 9) * 4 * 7
+8 * 7 * (3 + 4 + (5 + 7 * 4 + 2 + 7) * 7 + 8 + 9) + ((8 + 3) + 3) * (9 * 2 + (7 * 6 + 3 + 3 * 2) + (8 * 6 + 8 * 8 * 4 * 9)) * 4
+5 * (3 + 5) + 5 * 7 * 4
+(5 * 5) * (5 * 4 + 8 + 6 + (2 + 6 + 2 + 6 * 4 * 8) * 6) * 7 + 3
+(6 * 9 + 8 + (9 + 8 + 2 * 4 * 2 + 3) * (8 + 6 * 9 + 9)) + 9 * 5
+(3 + (2 + 6 * 5 + 9 * 4) * (2 * 4) + 2 * 3) + 4 + 6 + (7 + 2) * 6 + 4
+5 + (4 * 2 + 7 * 6 + 6 + 3) + (7 + 7 * (8 * 3 + 8 * 4 + 4 * 2) + 7 * (8 + 2 + 9 * 6 + 4))
+(7 * 4 + 7) + ((6 + 7 * 3 + 7) * 9 + (9 + 6 + 3) * 9 + 9) * 2
+8 + (5 * (3 * 2 + 7 + 2) + (7 + 6)) * 9
+8 * (6 + 5 + 8 * 3 * 8 * 6) * 8 * 9 * ((4 * 5) * 2 * (2 * 3 * 8)) + 5
+5 + 5 + 5 * 2 * 2 + 4
+(3 + 3 * 5 * 3 * (2 + 9 * 4 + 2 + 2 * 6)) + 4 + (8 * 9 + (9 * 8) + 9 + 7)
+(9 * (3 + 2) * (8 * 8 * 5 * 4) * (9 * 4 + 8)) + 8 + 6 + 3 * 8
+(2 * 2 + 9) + 5 * 8 * (3 * 4)
+6 * 9 + 3 * (9 + 8 + 7 * (6 * 9 * 4 * 2)) + 4
+((6 + 9 + 9 + 6) * 2 * 8) * 3
+4 * (4 * (8 + 5 * 2 * 2 + 3 + 4) * (8 + 3 * 5 * 5)) * 9 + 3 * (6 + (9 + 2) + 8 + (2 + 3) + 7 * 6) + (4 * 4)
+(8 * 8 * 5 + 2) * 9 * 8 + 8 * 4 * 2
+4 * 9 + 8 + 4 * 6
+4 * ((6 + 2 * 8) * 9 * 9) + 7 + 5 + 9 + 8
+(4 * 6 * 2 + 9 + 6 + 6) + (4 + 2) + 6 + 3 + (6 + (5 + 7 + 8 + 3) * 7 + (4 * 5 + 6 + 9 * 7 * 4))
+9 * 7 + ((2 * 7 + 3 * 9 + 3 + 9) + (6 * 8))
+(7 + 6) + 9 * 8 * 9 + 6
+3 * 3 * 4 + (2 * 9 * (6 + 2 * 4 + 9 * 8) + (7 * 9 + 4 + 4 * 4 * 6) * 8 + 8) + 5 + ((7 + 7 * 9 * 8) * 4 + 4 + (5 + 5 + 6 + 6) + 4 + 8)
+(4 * 9 + 8 + (4 * 2 + 5 * 3 * 7 * 2) * 5 * 2) * (4 + (8 + 5) + 9 + 3 * (9 * 4 * 5 + 4 + 2)) * 3 * 3 * 9
+(5 * (7 * 2 + 9 * 2) * 6) + 9
+((3 * 2 * 6 + 3 * 7) * 6 * (9 + 6 * 7 + 4 * 5) + 6 * 9 * 3) + ((6 + 3) * 3 + (5 * 5 + 7 + 5 + 4) + 2 + (9 + 2 + 9 * 2) + 2) + 6 + (6 * 7 + (7 * 3 * 5) * 2 + 3 * 7) * (6 + (8 * 6 + 4 + 6 + 2 * 8))
+8 * 3 + 2 * (6 + (2 + 9 * 8) * 2 * 9)
+(9 * (7 + 3 * 8 * 5) + 7 + 3 + (4 * 2 * 3) + (7 + 2 + 2 + 3 * 7)) + 5 * ((6 * 5) * (9 * 4 * 8 * 2 * 2 * 5) * 9 * 2)
+5 + ((2 * 4 * 9) * 6) + (9 + 7 + 2 * (2 + 5 + 6 + 2)) * 9
+9 * 6 * (9 + 5) * 2
+9 * 2 * 2 + 6 + (8 + (5 * 5 * 6 * 6 + 4 + 7) + 6) + ((3 * 7) * 4 * (2 * 6 + 9 + 2))
+(2 + 4) * 5 + 5
+(7 + 8 * 2 + 5 + 3 + (3 + 4 * 9 * 9 + 4)) + 2 * 8 + 3
+3 + 9 + 5 + (8 + 3 + (9 + 8 * 6)) * 8
+8 * (6 * (2 * 3 + 5 + 9 * 7 * 8) * 2 * 5 + 5) + 7 * 2
+3 * (3 + 3 + 2) * 6 * (8 * 6 + 5)
+6 + (8 + 2 + 5) + (5 + 4 * (3 + 3) + 3) + 4 + 9
+(5 * 5 * 3) + ((4 * 4 * 9 + 8) + 9) * 2
+2 * (4 * 3) * 2 + 3
+7 * 2 * 5 + 4 + 5 + (8 * 7)
+3 + (4 * 6 + 4 * 8 * (6 + 7 * 7 * 7 + 5))
+3 * (8 + 5 + (6 + 6 * 8 * 7 + 6 * 8) + 3 + 2 * 5) + 3 + 9 + 6 + 5
+6 + (2 * 6 * 4 * 9 + 4) * (9 * (7 * 4 + 4 * 5 + 2))
+(7 * 3) * (5 * 6 + 9 * 6) * 2 * (9 * 7 + 7 + (2 * 4 * 6 + 9) + 9 + 9) * 4 * 4
+(4 * (8 * 3 + 3 * 2) * 7) * 2 * 3 * 9 * 5 * (3 + (2 + 9) * 5 + 7 * (6 + 9 * 2 * 2 + 9) * 9)
+3 + 9 * 7 + ((3 + 4) + (4 * 3 * 4 * 2 + 2) + 9 * 4)
+3 + 6 + 2 + ((2 * 9 * 4) + 5 + 5 * 5 + 8 + 4) * (7 * (9 + 5 + 7 + 5 * 2 + 7)) * 3
+5 * ((2 * 9 + 8) + 4 * 7 * 5) * (5 + 5 + (9 + 8 + 7 + 5 + 5) + 2 + 8) + 7 * 6
+9 + ((7 * 3 + 4 + 3 * 3 + 7) * 5) + (8 + 2 * 6 * (8 * 9) * 4 * 7)
+4 + 3 + 6 + 3 * 5 + (8 * 4 * 2)
+(9 + (2 * 4 + 6 * 3) + 7 * (4 + 6) + 3 + (6 + 2 + 8 + 9 + 5 * 7)) + (9 + 3 + 4) * 3 + (8 * 4) + 9
+8 + 8 * (6 + 9 + 2) * 6
+4 + 7 + (3 + 4 + 5 + 7) + (5 + (9 + 6 + 8 + 7 * 3) * 3 * 7 * (2 * 4 + 3 + 6) + (8 * 9 * 2 + 6 * 6 * 5))
+(2 * 7 + 4 + 8 * 8) + 3 + 7
+(4 * 3 * 4 + 3 + 8 + 5) + (8 * 6 * 5) * 9 * 7 * 7 * ((7 * 5 + 8 * 4 + 2) * 8)
+4 + ((9 * 9) + (6 + 2)) + 9
+((8 * 3 + 3 * 6 + 5) * 5) * 6 * 8 + 5 * (3 + 9 + 5)
+8 * ((9 + 6 + 3 * 2 + 4) * 9 * 3 * (6 + 7 * 6 * 2)) + (3 * 4 * (3 * 9) + (9 + 9)) + 2
+8 * (6 + (6 * 6 + 5 * 4 * 2) + 7 + 5 * 5 + (8 + 9)) + 3 * (4 * (9 + 4 * 9) * (2 * 6 * 4 + 3 + 2) + (7 + 3 + 5 + 6)) * 5 + (3 + 9 * 6 + (3 * 4 * 8 + 7 * 7))
+5 + 8 * 3 * 8 + 9
+3 + (4 * 8 + (5 + 5 + 3 + 9 + 2 + 6)) + ((4 + 9) + (8 * 7 + 3 + 6 * 6) + 7)
+(2 * 2 + 7 + 2 * (9 * 2)) * 3
+7 * 3 + 2 + 9 * ((2 + 2 + 3 * 4 + 2) + (4 * 9 * 5 + 9 + 8) * 3)
+(8 * 6 + 4) + (7 + 8 + 3) + 4 + 9
+(4 * 6 * 5 * 6) + (2 * 4 * (5 * 9 * 8 + 7) * 2 * 3 + 6)
+(6 * 5) * (3 + 2 * 3 * 9 * 4)
+9 + 4 + (3 + 3 * (7 + 2) * 5) * (5 + 8 + 5 * 8 * 2)
+(3 * 4) + ((3 + 4 * 9 * 7 * 5) * 6 * 8 + 6) * 5
+3 + (8 * (8 * 7 * 2) * 8 * 3 + (9 + 9 + 5) * (3 * 4 + 3)) + 5 * 7
+6 * 3 + 8 + (7 * (5 + 8 + 9 + 5 * 6 * 3) * 3 * 8 * 6 + 5) + 6
+7 * 8
+3 + 7 * (7 + 9 * 4 * 2 + 9 * 7)
+(4 * 7 * 4) * (3 + 5 * 6 * 6 * 2 + 6) * 8
+8 * 5
+(7 * 8 + 4 + 8 * (4 + 7 * 5 + 7 * 5)) * 3 + 3 * 8 + 9 + 6
+8 * (8 + (5 * 5 * 5 + 9) * (8 + 6)) * (6 + 2 * 9) * 2 * 3 + 6
+(6 * 8 * (5 + 2)) + (3 + 6 + (9 + 9 * 2) * 3) * 8 * 4 * 7 + 8
+(3 * 9 * 2 + (8 + 8) + 9) + 2
+(8 * 2) * (8 * 6 * 4 + 6 + 3 + 3)
+7 + 5 + (3 + 2 * 2) + 5 + (6 * 8) * (7 + 6 + 6 * 9)
+(3 * (2 + 9 * 5 * 8 * 7) + 9 + 4) + 9 * 5
+5 + 3 + (5 + 8 + 4 * 5 + 8 + (5 * 3 + 7 * 6 + 3 * 8)) * 2 + 7 + 3
+(5 + 6 + 7 * (9 * 7 * 2 + 3 + 8) * 8) * 4 + 2
+6 + (2 + 5 + 2 * 7 * 7 + 6) * 8
+8 * 8 + (7 * 4 + 2 * (6 + 5 + 2) + (3 * 2 + 8 + 9 * 7)) * (3 * (2 + 9 + 9 * 4 + 2 * 9) * 4)
+(5 + 8 + 8 * 8 * 9 * 6) * 3 + 5 + 7
+8 + 5 + 6 * ((6 + 7) * 5 * 2 * 9 * 3 + 2) + 2 * 4
+(8 * 4 + 5 * 7 * (7 + 7 + 3 + 7 + 9) + 9) + (3 * 2 + (7 * 7)) * 2 * 6 * 2
+4 * 6
+(9 + 8 + 2 * (9 + 7)) * 4 + 2 + ((6 + 9 * 3) + 5 + 5 + 4 + 2 + 8) * 2 * 6
+(8 + (4 + 9 + 9) * (7 + 6 * 4 * 5 + 7) + 3 * 2 * 5) * (9 * 5 * (2 * 7 + 2 * 6)) + 3 + 8 + 3
+3 + (7 * (4 * 2) + 7 * 5 + 8 + 6) * 4
+8 * 7 * 5 * 4 + (2 * 7 * 6)
+8 * 9 * 5 * ((6 * 4 * 5) + 4 + 2 * 5 * (4 * 4 * 7 + 4 * 6 * 6))
+8 + 8
+4 * 3 * 7 + 8 + (8 * 7 + 5 + 7 * 3)
+(9 + 4 * (6 * 2 + 5 * 6)) + 7 + 7 * 6
+3 * (8 * 6 + 3) + 2
+9 + ((7 * 8) + 6 + 5 + (4 * 4 * 9 * 5) * 8)
+7 * (9 + 8 * 3 * 3)
+2 + ((6 + 7 + 8) * 4 * 4 * 3) + 6 + (7 * 2 * 4 + 4 * 6)
+2 + 2 + 6 + 9 * (8 * 2 + 2 + (7 * 8 * 5 + 5) * 7 * 3) + 8
+(5 + 6 + (9 * 8 + 7 + 2 * 3 * 2) + (9 + 9) * (3 * 3 * 6 * 2 * 3 + 6)) + ((9 + 3) + 2 * 4) * 7 + 2 + 2
+(4 * (6 * 8 * 5) + (9 + 2)) * (2 + 8 + (2 + 9 * 7 * 5 * 2) + 6 + 8) + 8 + 2 * 4
+9 + 3 * 7 * 8
+(6 + 4 + 7 * 6 + 9) + 4 * 4 + 9 * 9
+(8 + 9 + 9) * (5 * 6)
+7 + (9 + 4 * 2) * 6 + (9 * (4 + 2)) * 7 * (2 * 7 + 5 + 2 * 6 + 2)
+4 + 5 * 4 + 5 * 7 * (8 * 5 + 5 + (4 * 8 * 7 + 8) * 3)
+8 + 5 * (8 * 3 * 5) * 9 * (4 + 6 + 6 * (5 * 9 * 9 + 5 * 7 + 2)) * 8
+(7 * (6 * 9 * 8) + (8 + 4 * 7 * 2 + 4) + 8 * 3 + (6 + 6 * 3)) * (4 + 4 * 8) * 8 * 7 * 2 * 4
+(9 + 5 * 5 + 6 + 3) * 9
+8 * (7 + 6 * 9 + 4 + 9) * 2
+((9 + 6 * 4 + 7 + 3 + 7) + 5 * 9 + (3 * 9)) + 3 + 7 * (7 + (4 + 5 + 3 * 5)) * 9
+2 * 6 + 4
+(6 + 6 + 5) * (5 * 8 + 6 * 5) + (9 * (7 * 6 + 3 * 3 * 4 + 7) + 7) * 4 * 4
+8 + 6 * 4
+(3 + 3 + (4 * 6 + 5 + 9 + 7) + (8 + 6) + 8 + 2) * 5 * 6 + 7 * 7 * (9 * 5 * 8 * 7 * 3)
+((2 + 6 * 8) * 2) + 7
+6 * 2 * 3 + (4 * 5 * 4 + 2)
+6 + 4 * (4 + 3 + 2 + 8) * 5 * 4 * 5
+2 * 4 * 2 + 7 * 4 + (5 + 7 + 3 + (7 * 6 + 8 * 8 + 7) + 4 + 3)
+8 + 8 * 7 * (4 * 9 + (9 + 4 * 7 * 6)) * 7 + (4 + 4 * (3 * 2))
+9 + 6 + (8 * (2 + 8) + (3 + 2 + 2 * 4))
+(4 + 4) + 3 * (9 * (6 * 6 * 4 * 8) + (3 * 8 * 5 + 2 * 2 + 3) * 9 + (8 * 5 + 4 + 8 + 2 + 9)) * 4
+(3 + 8 * (2 + 2) + (9 + 6 * 3 + 3 * 7 + 5) + 7 + 2) + 8 * 6 + 7
+7 * 9 + (7 * 3 + (9 * 4)) + 5
+((9 + 7 + 3 * 6 + 9 + 3) + 9 + (4 * 8)) + 9 + (3 + 8 + (7 * 4) + 3 + 9 * 4) * 9
+(4 * 8 * 5 * (5 * 5 + 7 * 6 + 2 * 7) * (9 * 6 + 4 * 2 * 2 + 8) + 7) + (4 + 6 + 9 * 8 + 2) + 9
+8 * (9 + 9 * 6 + 2 * 5 + 2) + 7 + (9 * 8 * 9 * (6 + 5 * 6)) * ((6 * 9 + 2 * 8) * 6 + 5 + 6) + 2
+(9 + (2 + 2 * 4 * 6) * (6 * 4 * 4 * 7) + (6 * 7 + 9 * 9 * 6 * 8) + 4) * (5 + 5) + 5 + 5 + ((6 + 8 * 2) + 8) + 6
+8 + (6 + (3 * 7 * 3 + 5 + 4 + 5) * (4 * 7 + 5 + 5 * 4) * 4) * 8 * 7 + 5
+6 * 2 * 7 * 4 * (3 * 9 * 7 * 2 + 7) + 5
+9 * ((6 * 2 * 4 + 3 + 8) * 8) * 2 + 7
+(7 + (7 * 6 * 3 * 6 * 6 * 7) + 8 + 9 * 7 + 6) + 5 * 5 + (3 * (5 * 3 * 5 + 6 * 2 * 6) + (2 + 9)) * 3
+((6 * 7) * 6) + 4
+6 + 6 + 9 + 7 * (8 * 2 * (7 * 7 + 9) + 2 * 4) + 6
+2 + 4 * (2 * 8 + 2) + 3 + (3 * 9 * 2 + 5 + 5 * (3 * 3))
+6 + 8 + (6 + 6) * 3 + ((6 + 7 + 4 * 5) * (9 + 3 + 3)) + (3 * (3 * 8 * 4 * 7) * 6 * 2 * 4 + 6)
+3 * 9 + (3 * 6 + (2 * 9 * 7 * 5 * 8) * (6 * 9 * 7 * 7 * 3) + 6)
+7 + (8 + (3 + 3 + 2 + 4) + (8 * 7 + 8) + 9)
+4 * ((7 * 4 + 3) + 9 * 4 * (3 + 5 * 6) + 8 + 6) * 8 * 8
+9 + 9 * 2 + 2 * 6
+(5 + (9 + 4 * 5) * 9) * 7 + 8 * 7 + 5 * 8
+(3 * (6 + 8 * 7 * 8 + 3) + 9 * 7 + 6) + 9 + 3 * 3 * ((3 + 5 + 3 + 4 + 8) + 2 * 4)
+((4 + 4 + 4 + 9 * 7) * 7 + 9 + 2 * 7 + 9) * 5 * 5 * 8 * (4 * 8 * 4 + 8)
+(5 + 5) + 3
+4 * ((5 * 8 + 9) + 8 * 9 * (2 + 4 * 9 + 5 + 8 * 2) * 2 + 6) * 5 * 8
+5 * (7 + 7 + 7 * (6 + 5 * 5 + 2)) + 3 + 3 * 3
+4 * (9 * (3 + 3 * 9 * 2) * (8 * 3 + 6 + 3 + 3) * 5 + 5 * 8) + (3 * 4 + 8 + 2) + 8
+(4 * 8) + 9 * (6 + 2) * 3
+9 * 7 + (2 + 3 + 4 + (2 * 2) * (5 * 4 * 5 * 3))
+5 + ((4 + 8) * 9) * 9 * 5
+9 + (5 + 8 + 9) + 5 + 4
+(6 + 6 + (6 + 4 + 7 * 7) + 9) + 9 + (5 * 6 + 9 + 4 + (4 + 2 + 5 + 2) + 7) * 4 + 6
+(4 * (6 + 5 * 6 * 5) * 5 * 3) + 5 * 6 * 9 + 4 * 8
+(8 + 2 * 2 + 8) + 2 + ((2 + 9 + 3 + 7) + 8) * (3 * 9 + 3 + 8) + 2
+2 * 2 * 4 * 5 * 6 * 8
+2 + 8 * 7 + 3 * (5 * 8 + 6 + 3 + 4 + 7) * 5
+3 * (4 * 3 + 5 + 8 + 8) + 2 * 9 * 9 * 4
+((7 * 4 + 5 + 8 * 5) * (2 * 8 + 3 + 5) + (7 * 2 + 9) + 9) * 3 + 9 + 9 * 9
+4 + 9 + (7 * 7) + 5 + (8 + 2)
+((8 + 2 * 3 * 2 * 4) + 8 * 8) + 2 + 3 * ((7 * 6 + 6 * 4) + 9 + 9 * 8) * 5
+(5 * 7 * 7) + 5 + (4 + 7 + 5 + (4 + 7 * 9) + 9 * 9) * 2
+5 * 9 * (8 + 6 * (5 + 5 + 6 * 8) + 8 * 4) + (7 * 8) * 8
+4 * (2 * (7 + 7 * 7 + 8 * 9 * 2) + 8 * 2 + 6)
+((5 + 2 * 3 * 4) + (2 + 5 + 3 + 3) * (2 * 5 + 8) * 8) + 4 + 8 + 7 * 9
+(9 + 7) + 8 * 9 * (9 + 2 * 6 + 8) + 4
+(9 + 7) * 5 * 7 * (4 + 6 * 4 * (6 * 7 + 5 * 3)) * 8 + 3
+7 * (3 + 2) * 2 + 9 * (8 + 9 + (8 + 9 + 6)) * 8
+(5 * 8 * 9 * 9) + 4
+7 * 5 + ((3 * 2 + 4) * 5 + 7) + ((7 * 3 * 8) * 4 * 7)
+(9 + 9) + (6 * 6 * 7) + 6 * 3
+3 + 9 + 9 * 5 * (7 + 3 * (4 * 5 + 9) * 5)
+3 * 8 + 9 * (2 + (2 * 3 * 7 + 8 * 4) + 9 * 8 + 7) * 7 * 4
+4 + 9 * (7 * 9 + (5 * 9 + 8))
+(2 * (7 * 5 + 6 * 6 + 5 * 2) * 5) * 5
+((8 + 2 + 6) * (5 * 3) + 8) + 7 + 7 + 7 * 9
+(3 * 3 * 8 + 9 + 3 * 3) + 4
+7 * 8 * 6 + 3 * 2 + 3
+7 * 3 + (2 * 3) * 5 + 6
+9 * (6 * (4 + 2 * 8 + 6) + 5 * 2 * 2)
+(4 * (4 * 6 + 9) * (4 * 2 * 4) + 3 + 3) + ((4 + 8) * 2 + 6 * 9) * 6 + 9
+5 + (4 * (5 + 7 + 5 + 7) * (9 * 3 * 9 * 7))
+6 * (5 + 9 * 8 + 5 + 8) * (8 + 2)
+(8 + 3) * 6 + (8 + 2 * 5 * 2)
+(6 + 6 * (8 * 6)) + ((2 * 5 + 3 + 5 + 5 + 8) * 8 * 4 * (6 * 8 + 7 * 9 + 5) * 8)
+5 * 4 * 5 * 9 + 2 * 4
+8 * 7 * (5 * (6 + 7 + 9 + 3 + 9 + 5) + (6 * 3 * 3) * 4 * 6)
+2 + (8 * 6 + 9 * (7 * 8 + 6 * 3 * 6 + 5) + 6 + (7 * 4 + 4 * 7)) + 9 + 5
+7 + 9 * 6 + (5 + 8 * 6 + 9) + 6
+(2 + 4 * (5 * 9) + 5) * 8 * 4 * 5 * 8
+8 + 7 + 5 + 9 * 7
+3 * 4 * 5 * 8 * (4 * 3)
+(4 + 8 + 4 * 5 * (2 + 5 + 9 * 7 * 2 + 7)) * 3 * 5 * 2 + 5
+7 + (4 * 8 + 9 * 3) + 6 * 3 * (6 + 5 + 7 * 3) * 5
+((9 * 6) + 8 * 6) + (9 + 9 * 6 + 9) + (8 * 6 + 5 * 4 + 3) + 5 * 4 * (6 + 5 * 3 * 9 + 6 + (5 + 8 * 2 + 7))
+(7 + (5 + 8 * 2) + (4 + 8 * 7 + 9 * 5) * 9 * 5 * (2 + 8 * 9 + 3 * 2 + 5)) * 9 + 5
+(7 + 8 * 7 + 7 * 8 * 9) + 7 + 6 * 5 * (5 * 4 + 5)
+4 * (2 + 4 + 4)
+(3 * (9 * 8 + 6 * 4 + 6)) + 5 * 3 + 2 + (4 + 5 + 8)
+6 + 6 * 6 + ((7 * 4 + 7) * 6 + 9)
+6 + 6 + (2 + 4 + 5 + 5 * 9) * 2 * 4 + (3 * 8 * 6 + 9)
+(2 + 7 + (5 * 5 * 7 + 8) * 5) + 4 + 3
+(7 * 7 + 8 + 9) * 2 + 5
+5 * (5 * 2 + 2 * 9 * 5) + (2 + 8 * 3 * 4 + 2 * 8) * 8
+2 * 6 * 4 + (8 * 9 * 8 * 4 * 3) + 7 + 3
+(9 * 4 * 8) * 5 * (5 * 7 * (3 + 3 * 6 * 2) * 5 + 7 * 2) + (2 + 8 * 2) * 2 + 5
+5 * (7 * 2 + 6 * 9 * 3 + (3 + 2 + 6 + 7))
+(2 * (4 * 2) * 7) + 3
+5 * (3 + 2 * 5) * 5 + 8 + 3
+(5 + 6 + 6 * 2) * 5 * (5 + 8 + (9 * 8 * 4) + 9) + 9 * 7 * (3 * 8 * 8 * 3 * 8)
+((7 * 9 + 8) + 6) * ((9 + 7 * 8 + 6) * (4 * 4 * 4 * 8 + 5 + 6) * 8 * 7 + 4 * (2 * 2 + 3))
+(5 + (4 + 7 + 8 + 6 * 8 + 5)) + (8 * (7 + 4 * 7) * (8 + 8 * 5 * 6 * 4) + 9 + (3 + 4 * 6)) + 3 + 2 + 3
+8 + (8 * 7 + 5 + 3) + 7 + (8 + (5 * 5)) * 6
+2 + 4 + 4 * 9
+7 * 4 * 2 + 4 + 3 + (8 * 6 * 6 + (5 * 2 * 6 * 9 * 7) + 7)
+8 * (5 * 3 + 2 * 6 + (6 * 5 * 4)) * 8 + (4 * (2 + 7 * 3 + 9) + (2 * 3)) + (4 * 3 + 6 * 3 * 7 * 3)
+9 + 6 * (3 * 9 + 2 + 3 + 6) + 5
+(9 * 6 + 8 + 8) + 8 + 6 * 9
+((6 * 9 + 2 + 8 + 4) + 6 * 7 + 8 + (2 + 5 + 7 + 5 + 3 * 8) * 5) * 6 + (2 + 4) * 7 + (3 + 2 * (4 * 8 * 5) * 2 + 7 * 9)
+(2 + (5 + 9 * 7 + 6) * 2 + 7 * (4 * 6)) * 9 * (7 + (8 + 5 * 3) + 3) * 5 * 3 * 5
+(7 + (8 + 5 * 7 * 2)) + 2 * 7 + (2 * 5 + 7) * 8
+4 + 8 + (2 + 9 + 4)
+((3 + 7) + 7 + 5) + 2
+6 + 8 + 9 * 2 + 9 + (6 + 4 + 3 * 4)
+(9 + 2) * 7 + 7 + (3 + 4) + (8 + 3 + 3 + 5) + (2 * 7 + 5 + 4 + 3 + 8)
+3 * ((7 + 9) + 5 + 9 * (9 + 6) * 3 * (9 + 2))
+(7 * 3 * (5 + 2 + 5 + 8 * 3 + 7) * 3 * 3 * 6) * 4 + 8 + 3 * 5
+4 * (5 + 7 * 6 * 5 * 2) + 6 + 3
+7 * 6
+9 + (2 * 7 * (8 + 2 + 5) * 8) + (7 * 8 + 9 * 7)
+(4 + (8 * 5 * 9) * 2 + 8 * 4 + 4) + ((3 * 9) + 6 * 3 * (3 + 9 + 6 * 2 + 5) * 7) * (2 * (5 * 5 * 2 * 6 * 9)) * 6 * 9
+(7 + (4 + 9 * 2 + 8)) * 6 * 8 + 7
+8 + (8 + 5) * (3 + 3)
+5 + 3 * 9 + 2 * (3 + 7 * (6 + 2 * 4 + 3 + 3) * 5)
+5 * 9 * (3 + 9 * (4 * 6 + 2 + 3 + 3) * 4 + 8 * 4) * 8
+3 * (9 * 8 + 4 + 5) + ((2 * 6) * 2 * (3 + 6 + 6) + 3) * 7
+8 * (6 + 4 * 8 * 8 * 4)
+(6 + 8 * 8 * 2 * (2 * 9 * 3 + 3) + 7) * 5
+4 * 5 * (3 + (9 + 3 * 6 + 9 + 7) * 5 * (2 * 4 * 8 * 2) + 6 + 2) + 5
+2 * 5 * (8 * 5 * 4) + (7 * 2) * (7 + 5 + 6 * 6)
+5 + 3 * 3 * 7
+9 * (3 + 7 * 3 + 7) * 2 * (6 * 7 + 3) + 4 + 5
+4 + 6 + 7
+9 + 2 * (6 + 5 * 5 + 4) * 6
+5 * 7 * (5 * 9 + 4 * 3 * (7 * 6 + 3 + 3 * 6 * 9))
+9 + ((3 * 7 * 9 * 6 * 5) * 6 + 9 * 4 * 8 + (6 * 5 + 7 + 9 * 3)) + 3 * (9 + 2) + 3
+7 + 3 + 6 * 6 * (7 * 4 + 9 + 7) + 4
+6 + 8 * (7 + 2 + 2 * 7 + (8 * 9 * 2 * 7)) * 2 * 9 + 7
+(9 * 6 + 7 + 2) + 3 * (4 * 2 * (3 * 6 + 5 + 3 * 8 + 6) * (3 + 4 + 9 * 7 * 2) * 7 * 9) + (6 * 6 + 4) + 5
+8 * (3 * 9) * 6 + (5 * 2 + 9 * 3) * 4 + (5 * 7)
+7 + 4 + (7 + 6 * 7 * 8) * (8 * 3 + (4 + 5 + 3 * 9 + 6 + 5) + 8 * 5 + 5) * 3
+4 * (4 + 9) + (7 + 5) + 3 + 7 + 9
+3 + (8 * 9 * 3) * 9 + 2 * (7 * 4 * 3)
+6 * 2 + ((2 + 4 + 5 + 8 + 2 + 6) + 8 * 9) * 9 * 5 + 7
+6 + ((3 + 2 + 9 + 9) + 8 * 2 * 6 + 4) + 3 * 6 + 4 * 9
+(3 * 5 + 7) + ((7 * 7 + 5 + 8 * 3 * 2) + 9 * (9 + 4 * 3 + 7) + 6) + 7 + 3
+(4 * (3 * 7 + 9 * 2 + 6)) * 5 + 9 + 7 + 4 + 7
+8 * 5 * 4 + 7 * (4 + 7 * (9 + 6 + 2 + 9)) + 9
+8 + 4 * 3
+7 + 2 + (4 * 3 * 9 + 9 * 7 * 9) * 7
+3 * 6 * 9 + (4 + 9 * 4 + 3) * 3 + 6
+3 * (3 + 7 * 6 + 4 * 4) * (9 + 5 * 5 + 6 + 7 * 5) * (3 + 7) + 4
+9 + 6 * ((3 + 7 * 6 + 9 * 4 * 4) + 5 + 5 * 3 + (4 * 6 + 3 * 5)) * 8
+9 + (5 * 9 + 2 * 4) + ((9 * 8 * 5 * 5 + 8) + 5 * 6 * 6)
+(4 * (8 + 5 * 4) * 9 * 9 + 5 + 5) + 4 * 7 * 8
+3 * 5 + (5 * 4 + 9 * 8 * (6 + 4 * 9 + 4 * 7) * 9)
+((4 + 4) + (6 * 2 + 9 + 3 + 5 + 7)) * 3
+6 * (9 + 8)
+6 + 8 + 5 * 7 + (2 * 6 * (6 * 5 * 4 * 6 + 8 * 9) * (9 + 6 * 5 * 9 + 7 * 8) * 8)
+((9 * 3 + 8 * 4) * 2 * 9 + 7) + 3 + 7 + 6 * 3 * 7
+(2 + 8 + 7 + 5 + 6 * (8 * 4 + 2)) + 8 + 4 * 4 * (3 + (2 * 6 + 6 * 9 * 8) * 9 + 9 * 5 * (4 + 6 + 3 + 5 * 9)) * 4
+9 + 4 * (5 + 4 + 7 * (8 + 8 * 2 * 8 * 2 + 3)) + 6 * 3 * (6 * 7)
+(7 + 9 * 6 * (9 + 7 + 6 + 4 + 4 + 5)) * 4 + 5
+8 + (8 + 2 * (4 + 5 + 5 + 5 * 3 * 8) + (5 * 6) + 3 + 2) * (7 * (4 * 5) + 3 * 5 * 4)
+3 * ((4 * 9) + 3 + 8 * 7 * 4) * 4
+5 * 9 + 8 * 4 + 2 * 3
+2 * 9 * 4 + 2 * ((3 + 8 + 7 * 9) + 7)
+(7 * 3 * (8 + 3 + 2 * 5 * 9) * 9 + (7 + 2 * 9 + 5 + 2) * 6) * (9 + 6 + 4 * 9 * 6 + 6)
+7 * 5 * 5
+(4 * 7 * 6 * 5) * ((7 + 5 * 3 + 4 * 2) * 5 * 9 + 5 * 6) + 3 * 8 * 5 + 9
+6 * 6 * (4 + 5 + 6 + 9 + 6 * 3) + 4 + ((7 + 5 + 6 * 7) * 9) * 5
+3 + 6 * 9 * 5 + 3 * ((9 * 7) * (6 + 8 + 5 + 7 * 8 * 7) + 4 + 4 + 4 + (6 * 7 + 4 + 2 + 5 + 9))
+9 * ((4 * 2 * 6) * 7 + 4 + 6) + 4 * 4
+6 + 8 + 5 * 4 * ((2 + 2) * 6 * 9) + 4
+(8 * 4 + 8) + 3 * 4 + 7 * 9 + (5 * (8 * 7 + 2 + 3 * 4) + 2 + 3 * 8 * 8)
+7 * 9 + ((2 * 9 * 6 * 6) + (6 * 2) * 7 + (8 + 3 * 6 + 4 * 5)) + 8 * 9
+8 + ((3 + 3) + 7) * (4 + 3 * 3 * 7 * 7 + 9)
+(9 + (4 + 6 + 7) + (4 + 4 * 4) + 6 + 4) * 3
+4 * 6 * ((8 + 3 * 3) + 7 * (5 * 7 * 3) * 3 * 8) * 5 + 2 * 3
+((6 * 5) + (7 + 6 + 7)) + 2 * 3 * 2
+5 + 3 * 8 + 4 * (9 + (2 + 7 + 7 * 3 + 8 * 2) + 2 + (3 + 6 * 7 + 5))
+2 + 7 * 4 * 7 * (7 + 3 + 9 * 5 * (5 + 6 * 6)) + 3
+((2 * 2 + 7 + 2 + 4) * 7) + 2
+6 + 4 + 3 + ((9 + 5 + 2) * 4) + 9
+8 + ((3 * 8 * 7 + 6) * 3 + 6 * 2) * (4 + (2 * 8 * 2 + 9) * (7 + 4 + 7 * 5 + 7) + 3) * 4 * 5
+4 * (8 * 2 + 8) + ((5 + 5 + 3) * 6 + 5) * (7 * 9 + 7) * (9 * 5)
+2 + (9 * 4) + ((7 * 3) + 8) + 7
+4 + 6 * (9 * 2)
+(8 + 6 + (7 * 2) * 3 + (9 * 2)) + 5 + 8 * 3
+7 + (4 + 5 * 2 + 8 * 7 + 5) * 4 * 4
+4 * 4 * 6 + (7 * 3)
+(9 * 6 + 4 * 6 + (3 * 5 * 2 + 5) * 9) * 2 * (8 * (4 + 9 * 7 + 8 * 2 + 2)) + 5
+8 + 2 * 7 + 5 * (4 + (8 * 9 + 5 * 5 + 6) + 4 + 3)
+5 * (3 + (8 + 5 * 2) + 2 + 6 + 7) + (7 * (9 + 4) + 8 + (8 + 9) + 6) + (7 * 6 * 5 + 6 * (9 * 3 * 9 + 4) * 8) * 4 * 4
+2 + 7 * 8 + ((5 * 3 + 6 + 5 + 4 + 4) + 2 + 9 + 4) * (8 * 2) + 8
+8 * 9 * 2 + 4 * (7 * 5 + 8 * 5 * 4 + 5)
+(3 + 9) + ((3 * 2) + 5 + 4 * 8) + 3 * 9 + (3 + 7 + 7 + (5 * 7 * 7 * 9) + 5 * 8) * 5
+3 * 6 + 3 + 7 + (8 + 7) + 7
+6 + (7 + 5 + (2 + 8 + 3 * 4 * 3) + (9 + 6 + 4 * 2)) * 4 + (9 + 9 + 3 + 7 + 4 * 4) + 6 * (9 + (7 * 8 * 2))
+8 + (7 * 6 * 5) + (4 + 3 + 2 + 9) * 6
+6 + 7 * (7 + 3 + 3 + 9 * 2)
+(8 * (4 + 3 + 5 + 9 + 3) * 3 + 3 + (9 * 7 + 9 + 9 + 4 + 7)) * (3 * 3 * 3 + 6 * 9) + 2
+(2 + (4 + 8 + 6 + 9 * 3)) + 2 * 2 * 7
+4 + 5 + ((5 * 7) * 6 + 9 * 4 * 5 * 6) + 6 + 3 * 8
+8 * 7 + 5 + 5
+(3 + (7 * 4 + 3) * 9 + 4 + 7 * 5) + (6 + (3 + 3 * 5) + (6 * 6 * 7))
+4 * 8 * (7 * 7 * 6) + 6 * (2 * 5 + (6 * 4 * 9 + 2 + 5 * 5) * 7 * 5) * (6 * 6 * 7 * 6)
+(4 * 4 + 5 + 9 * 9) + 2 + 2 + 9 * 3 * 5
+((9 + 7 + 6 + 8 + 8) + 4 + 4 * (2 * 5 * 8)) * 4 + 7 * 7 + 4 * (6 + 2 + 7 + 5 * 6)
+9 + 5 + 9 + 3
+4 * 6 * 5 + 3 + (7 * (2 + 5 + 2 * 5 + 9) + (2 + 9 + 8 * 9 + 3 * 3)) * 5
+(3 * 5 * (4 + 2 + 8 + 4 + 7) + 7 * 7) * (6 * 7 + 9 * 7 + 7 + 9)
diff --git a/aoc2020/src/day18.rs b/aoc2020/src/day18.rs
new file mode 100644
index 0000000..1eb4531
--- /dev/null
+++ b/aoc2020/src/day18.rs
@@ -0,0 +1,120 @@
+use std::fmt::Write;
+
+use anyhow::{anyhow, Result};
+
+use nom::{
+    branch::alt,
+    bytes::complete::take_while1,
+    character::complete::{char, one_of},
+    combinator::{eof, map_res},
+    multi::fold_many0,
+    sequence::{delimited, pair, terminated},
+    IResult, Parser,
+};
+
+const INPUT: &str = include_str!("../input/day18.txt");
+
+pub fn run() -> Result<String> {
+    let mut res = String::with_capacity(128);
+
+    writeln!(res, "part 1: {}", part1(INPUT)?)?;
+
+    Ok(res)
+}
+
+fn part1(input: &str) -> Result<u64> {
+    input
+        .lines()
+        .map(|line| line.parse::<Expr>().map(|e| e.eval()))
+        .sum()
+}
+
+#[derive(Debug, Clone, Copy)]
+enum Operator {
+    Addition,
+    Multiplication,
+}
+
+#[derive(Debug, Clone)]
+enum Expr {
+    Num(u64),
+    Op(Box<Expr>, Operator, Box<Expr>),
+}
+
+impl Expr {
+    fn eval(&self) -> u64 {
+        match self {
+            Self::Num(val) => *val,
+            Self::Op(lhs, op, rhs) => match op {
+                Operator::Addition => lhs.eval() + rhs.eval(),
+                Operator::Multiplication => lhs.eval() * rhs.eval(),
+            },
+        }
+    }
+}
+
+fn operator(input: &str) -> IResult<&str, Operator> {
+    one_of("+*")
+        .map(|op| match op {
+            '+' => Operator::Addition,
+            '*' => Operator::Multiplication,
+            _ => unreachable!(),
+        })
+        .parse(input)
+}
+
+fn operator_expr(input: &str) -> IResult<&str, Expr> {
+    let (i, first_term) = term(input)?;
+
+    fold_many0(
+        pair(delimited(char(' '), operator, char(' ')), term),
+        first_term,
+        |acc, (op, val)| Expr::Op(Box::new(acc), op, Box::new(val)),
+    )(i)
+}
+
+fn num(input: &str) -> IResult<&str, Expr> {
+    map_res(take_while1(|c: char| c.is_digit(10)), |res: &str| {
+        res.parse().map(Expr::Num)
+    })(input)
+}
+
+fn term(input: &str) -> IResult<&str, Expr> {
+    alt((delimited(char('('), expr, char(')')), num))(input)
+}
+
+fn expr(input: &str) -> IResult<&str, Expr> {
+    alt((operator_expr, term))(input)
+}
+
+impl std::str::FromStr for Expr {
+    type Err = anyhow::Error;
+
+    fn from_str(s: &str) -> Result<Self> {
+        let (_, res) = terminated(expr, eof)(s).map_err(|_| anyhow!("couldn't parse expr"))?;
+
+        Ok(res)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn part1_provided() {
+        let tests = &[
+            ("1 + 2 * 3 + 4 * 5 + 6", 71),
+            ("1 + (2 * 3) + (4 * (5 + 6))", 51),
+            ("2 * 3 + (4 * 5)", 26),
+            ("5 + (8 * 3 + 9 + 3 * 4 * 3)", 437),
+            ("5 * 9 * (7 * 3 * 3 + 9 * 3 + (8 + 6 * 4))", 12240),
+            ("((2 + 4 * 9) * (6 + 9 * 8 + 6) + 6) + 2 + 4 * 2", 13632),
+        ];
+
+        for (expr, expected) in tests {
+            let expr: Expr = expr.parse().unwrap();
+            assert_eq!(expr.eval(), *expected);
+        }
+    }
+}
diff --git a/aoc2020/src/lib.rs b/aoc2020/src/lib.rs
index cf569f2..cefe9c3 100644
--- a/aoc2020/src/lib.rs
+++ b/aoc2020/src/lib.rs
@@ -17,3 +17,4 @@ pub mod day14;
 pub mod day15;
 pub mod day16;
 pub mod day17;
+pub mod day18;
diff --git a/aoc2020/src/main.rs b/aoc2020/src/main.rs
index 9c35ca5..ffcbda9 100644
--- a/aoc2020/src/main.rs
+++ b/aoc2020/src/main.rs
@@ -19,6 +19,7 @@ use aoc2020::day14;
 use aoc2020::day15;
 use aoc2020::day16;
 use aoc2020::day17;
+use aoc2020::day18;
 
 fn main() -> Result<()> {
     let days: &[DayFunc] = &[
@@ -39,6 +40,7 @@ fn main() -> Result<()> {
         day15::run,
         day16::run,
         day17::run,
+        day18::run,
     ];
 
     aoc::run(days)