diff --git a/2015/days/04/md5.py b/2015/days/04/md5.py
new file mode 100644
index 0000000..2454d9f
--- /dev/null
+++ b/2015/days/04/md5.py
@@ -0,0 +1,13 @@
+#!/usr/bin/env python3
+
+import hashlib
+
+key = "yzbqklnj"
+
+i = 0
+while True:
+    result = hashlib.md5(f'{key}{i}'.encode())
+    if result.hexdigest().startswith("0"*6):
+        print(i)
+        break
+    i += 1