from math import prod
from pathlib import Path

FILE = "input.txt"

def main():
    raw_lines = Path(FILE).read_text().splitlines()
    operators = raw_lines[-1].split()
    operands: zip[tuple[str]] = zip(*raw_lines[:-1])

    vals: list[int] = []
    sum = 0
    for val in operands:
        if all(v == ' ' or v == '' for v in val):
            sum += compute(vals, operators.pop(0))
            vals = []
            continue
        vals.append(int("".join(val).strip()))
    return sum + compute(vals, operators.pop(0))

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())