# -*- coding: utf-8 -*-

import re

S = input()
temp = re.split('[*+]', S)
terms = list(map(int, temp))
temp = re.split('[0-9]', S)
operators = list(filter(lambda c:c!='', temp))

# 計算する
answer = terms[0]
for i in range(1, len(terms)):
    term = terms[i]
    if operators[i-1] == '*':
        answer += term
    else:
        answer *= term
print(answer)