diff --git a/2025/d05/ex1/ex1.py b/2025/d05/ex1/ex1.py
new file mode 100755
index 0000000..2bb14b9
--- /dev/null
+++ b/2025/d05/ex1/ex1.py
@@ -0,0 +1,37 @@
+#!/usr/bin/env python
+
+import sys
+from typing import NamedTuple
+
+
+class Range(NamedTuple):
+    start: int
+    end: int
+
+    @classmethod
+    def from_str(cls, input: str) -> "Range":
+        start, end = input.split("-")
+        return cls(int(start), int(end))
+
+    def contains(self, point: int) -> bool:
+        return self.start <= point <= self.end
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> tuple[list[Range], list[int]]:
+        ranges, ids = input.split("\n\n")
+        return [Range.from_str(r) for r in ranges.splitlines()], [
+            int(n) for n in ids.splitlines()
+        ]
+
+    ranges, ids = parse(input)
+    return sum(any(range.contains(id) for range in ranges) for id in ids)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()