[//]: # 参照一位大神写的代码，自己重写一遍，值得再次复习

nums, ops = [], []
priority = {
    '+': 0,
    '-': 0,
    '*': 1,
    '/': 1
}

def eval():
    n1 = nums.pop()
    n2 = nums.pop()
    ans = 0
    op = ops.pop()
    if op == '-':
        ans = n2 - n1
    elif op == '+':
        ans = n1 + n2
    elif op == '*':
        ans = n1 * n2
    elif op == '/':
        ans = int(n2 / n1)
    nums.append(ans)



if __name__ == '__main__':
    s = input()
    i = 0
    while i < len(s):
        c = s[i]
        if s[i].isdigit():
            _n = 0
            while i < len(s) and s[i].isdigit():
                _n = _n * 10 + int(s[i])
                i += 1
            nums.append(_n)
            continue
        elif c == '(':
            ops.append(c)
        elif c == ')':
            while ops[-1] != '(':
                eval()
            ops.pop()
        else:
            while ops and ops[-1] != '(' and priority[ops[-1]] >= priority[c]:
                eval()
            ops.append(c)
        i += 1
    while ops:
        eval()
    print(nums[-1])