diff --git a/2015/d05/ex1/ex1.py b/2015/d05/ex1/ex1.py
new file mode 100755
index 0000000..48cf3f8
--- /dev/null
+++ b/2015/d05/ex1/ex1.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python
+
+import collections
+import sys
+
+
+def solve(input: str) -> int:
+    def is_nice(input: str) -> bool:
+        counts = collections.Counter(input)
+        if sum(counts[c] for c in "aeiou") < 3:
+            return False
+        if not any((c + c) in input for c in (chr(ord("a") + i) for i in range(26))):
+            return False
+        for bad in ("ab", "cd", "pq", "xy"):
+            if bad in input:
+                return False
+        return True
+
+    return sum(map(is_nice, input.splitlines()))
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()