#!/usr/bin/python

import re

with open('03a.txt') as f:
    text = f.read()

reg = re.compile(r'mul\((?P<num1>[0-9]+),(?P<num2>[0-9]+)\)')

total = 0

for match in reg.finditer(text):
    total += int(match.group('num1')) * int(match.group('num2'))

print(total)