import re

text: str

with open("input.txt") as f:
    text = f.read()

total: int = 0

do_or_not: bool = True

for x, y, don_t, do in re.findall("mul\(([0-9]{0,3})\,([0-9]{0,3})\)|(don\'t)|(do)", text):
    if (do != ""):
        do_or_not = True
    elif (don_t != ""):
        do_or_not = False
    elif (do_or_not):
        total += int(x) * int(y)
print(total)