#!/usr/bin/env python3
import re
from typing import List, Tuple

class Solver:
    def __init__(self) -> None:
        self.input: str = ""
        self.vals: List[Tuple[str, str]] = []
        self.clean_vals: List[Tuple[int, int]] = []
        self.pattern: str = r"mul\((-?\d+),(-?\d+)\)"
        self.result: int = 0

    def read(self) -> None:
        with open("input") as f:
            self.input = f.read()

    def get_matches(self) -> None:
        self.vals = re.findall(self.pattern, self.input)

    def clean_matches(self) -> None:
        for pair in self.vals:
            val1: int = int(pair[0])
            val2: int = int(pair[1])
            clean_tuple: Tuple[int, int] = (val1, val2)
            self.clean_vals.append(clean_tuple)

    def calculate_result(self) -> int:
        for pair in self.clean_vals:
            tmp: int = pair[0] * pair[1]
            self.result += tmp
        return self.result


def main() -> None:
    solution: Solver = Solver()
    solution.read()
    solution.get_matches()
    solution.clean_matches()
    result: int = solution.calculate_result()
    print(result)

if __name__ == "__main__":
    main()