diff --git a/2024/day03.py b/2024/day03.py
new file mode 100644
index 0000000..a4f2bd4
--- /dev/null
+++ b/2024/day03.py
@@ -0,0 +1,16 @@
+import re
+import fileinput
+
+
+MUL_RE = r"mul\((\d+),(\d+)\)"
+DONT_DO_RE = r"don\'t\(\).*?(do\(\)|$)"  # match a `do()` or end of string
+
+
+def count_muls(program):
+    return sum(int(x) * int(y) for x, y in re.findall(MUL_RE, program))
+
+
+program = ''.join(line.strip() for line in fileinput.input())
+print("Part 1:", count_muls(program))
+print("Part 2:", count_muls(re.sub(DONT_DO_RE, '', program)))
+