import sys
import re

def debug(x, table):
    for name, val in table.items():
        if x is val:
            print('DEBUG:{} -> {}'.format(name, val), file=sys.stderr)
            return None

def solve():
    S = input()
    nums = re.split(r'[*+]', S)
    nums = list(map(int, nums))
    ops = [op for op in S if not op.isdigit()]
    ans = nums[0]

    for i, op in enumerate(ops, start=1):
        if op == '*':
            ans += nums[i]
        else:
            ans *= nums[i]

    print(ans)

if __name__ == '__main__':
    solve()