diff --git a/2017/d01/ex1/ex1.py b/2017/d01/ex1/ex1.py
new file mode 100755
index 0000000..7d20719
--- /dev/null
+++ b/2017/d01/ex1/ex1.py
@@ -0,0 +1,17 @@
+#!/usr/bin/env python
+
+import sys
+
+
+def solve(input: str) -> int:
+    nums = [int(n) for n in input.strip()]
+    return sum(n for n, m in zip(nums, nums[1:] + nums[:1]) if n == m)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()