#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import collections
import itertools


def calc(equation):
    is_operator = lambda x: x in "+*"
    operators = collections.deque()
    operands = collections.deque()
    for key, group in itertools.groupby(equation, is_operator):
        if key:
            operators.append("*" if "".join(group) == "+" else "+")
        else:
            operands.append(int("".join(group)))
    value = operands.popleft()
    while operators and operands:
        operand = operands.popleft()
        if operators.popleft() == "+":
            value += operand
        else:
            value *= operand
    return value


def main():
    print(calc(input()))


if __name__ == '__main__':
    main()