diff --git a/2016/d05/ex1/ex1.py b/2016/d05/ex1/ex1.py
new file mode 100755
index 0000000..2768b1a
--- /dev/null
+++ b/2016/d05/ex1/ex1.py
@@ -0,0 +1,29 @@
+#!/usr/bin/env python
+
+import hashlib
+import itertools
+import sys
+
+
+def solve(input: str) -> str:
+    def crack_password(door_id: str) -> str:
+        password: list[str] = []
+        for i in itertools.count():
+            hash = hashlib.md5((door_id + str(i)).encode()).hexdigest()
+            if not hash.startswith("00000"):
+                continue
+            password.append(hash[5])
+            if len(password) == 8:
+                break
+        return "".join(password)
+
+    return crack_password(input.strip())
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()