# -*- coding: utf-8 -*-
"""
No.49 算数の宿題
https://yukicoder.me/problems/no/49

"""
import sys
from sys import stdin
from collections import deque
input = stdin.readline


def separate_string(S):
    numbers = []
    ops = []

    q = ''
    for s in S:
        if s != '+' and s != '*':
            q += s
        else:
            ops.append(s)
            numbers.append(int(q))
            q = ''
    numbers.append(int(q))
    return numbers, ops


def solve(S):
    numbers, ops = separate_string(S)
    ans = numbers[0]

    for n, o in zip(numbers[1:], ops):
        if o == '+':
            ans *= n
        else:
            ans += n
    return ans


def main(args):
    S = input().strip()
    ans = solve(S)
    print(ans)


if __name__ == '__main__':
    main(sys.argv[1:])