#!/usr/bin/env python3

import sys
import re

input_file = sys.argv[1]

with open(input_file) as fd:
    lines = [line.rstrip() for line in fd.readlines()]

t = 0
en = True
reg = r"mul\(([0-9]+),([0-9]+)\)|do\(\)|don't\(\)"
for line in lines:
    for match in re.finditer(reg, line):
        all = match.group(0)
        if all == "do()":
            en = True
        elif all == "don't()":
            en = False
        elif en:
            ast, bst = match.group(1), match.group(2)
            a, b = int(ast), int(bst)
            m = a * b
            t += m
print(t)