import re

lines = [l for l in open("input.txt", 'r').read().splitlines()]

summa, x = 0, [] 

for l in lines:
    x = [i.span() for i in re.finditer("mul\([0-9]{1,3},[0-9]{1,3}\)", l)]
    for start, end in x:
        tup = l[start:end].split(',')
        summa += int(tup[0][4:]) * int(tup[1][:-1])

print(summa)