from math import prod
from pathlib import Path

FILE = "input.txt"

def main():
    raw_lines = Path(FILE).read_text().splitlines()
    lines: list[list[str]] = [line.split() for line in raw_lines if line.strip()]
    problems: list[list[str]] = [list(col) for col in zip(*lines)]

    return sum(compute([int(x) for x in problem[:-1]], problem[-1]) for problem in problems)

def compute(vals: list[int], op: str) -> int:
    if op == '+':
        return sum(vals)
    elif op == '*':
        return prod(vals)
    else:
        print(f"unknown operator: {op}")
        return 0

if __name__ == "__main__":
    print(main())