diff --git a/aoc2015/input/day05.txt b/aoc2015/input/day05.txt
new file mode 100644
index 0000000..5642100
--- /dev/null
+++ b/aoc2015/input/day05.txt
@@ -0,0 +1,1000 @@
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diff --git a/aoc2015/src/day05.rs b/aoc2015/src/day05.rs
new file mode 100644
index 0000000..e7a9d6e
--- /dev/null
+++ b/aoc2015/src/day05.rs
@@ -0,0 +1,63 @@
+use aoc::Result;
+
+const INPUT: &str = include_str!("../input/day05.txt");
+
+pub fn run() -> Result<()> {
+    println!("part 1: {}", part1(INPUT));
+
+    Ok(())
+}
+
+fn part1(input: &str) -> usize {
+    input
+        .lines()
+        .map(|line| line.trim_end())
+        .filter(|line| {
+            let mut vowel_count = 0;
+            for c in line.chars() {
+                if "aeiou".find(c).is_some() {
+                    vowel_count += 1;
+                }
+            }
+
+            vowel_count >= 3
+        })
+        .filter(|line| {
+            let mut prev = None;
+            for c in line.chars() {
+                if let Some(p) = prev {
+                    if p == c {
+                        return true;
+                    }
+                }
+
+                prev = Some(c);
+            }
+
+            false
+        })
+        .filter(|line| line.find("ab").is_none())
+        .filter(|line| line.find("cd").is_none())
+        .filter(|line| line.find("pq").is_none())
+        .filter(|line| line.find("xy").is_none())
+        .count()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn part1_provided() {
+        assert_eq!(part1("ugknbfddgicrmopn"), 1);
+        assert_eq!(part1("aaa"), 1);
+        assert_eq!(part1("jchzalrnumimnmhp"), 0);
+        assert_eq!(part1("haegwjzuvuyypxyu"), 0);
+        assert_eq!(part1("dvszwmarrgswjxmb"), 0);
+    }
+
+    #[test]
+    fn part1_real() {
+        assert_eq!(part1(INPUT), 258);
+    }
+}
diff --git a/aoc2015/src/lib.rs b/aoc2015/src/lib.rs
index e051fbd..f290640 100644
--- a/aoc2015/src/lib.rs
+++ b/aoc2015/src/lib.rs
@@ -2,3 +2,4 @@ pub mod day01;
 pub mod day02;
 pub mod day03;
 pub mod day04;
+pub mod day05;
diff --git a/aoc2015/src/main.rs b/aoc2015/src/main.rs
index fee1657..fbc68a0 100644
--- a/aoc2015/src/main.rs
+++ b/aoc2015/src/main.rs
@@ -4,9 +4,10 @@ use aoc2015::day01;
 use aoc2015::day02;
 use aoc2015::day03;
 use aoc2015::day04;
+use aoc2015::day05;
 
 fn main() -> Result<()> {
-    let days: &[fn() -> Result<()>] = &[day01::run, day02::run, day03::run, day04::run];
+    let days: &[fn() -> Result<()>] = &[day01::run, day02::run, day03::run, day04::run, day05::run];
 
     aoc::run(days)
 }