#include <bits/stdc++.h>

using namespace std;

stack<int> num;
stack<char> stk;

unordered_map<char, int> h{{'+', 1}, {'-', 1}, {'*', 2}, {'/', 2}};

void eval() {
    int b = num.top();
    num.pop();

    int a = num.top();
    num.pop();

    char p = stk.top();
    stk.pop();

    int r;

    if (p == '+')
        r = a + b;
    else if (p == '-')
        r = a - b;
    else if (p == '*')
        r = a * b;
    else if (p == '/')
        r = a / b;

    num.push(r);
}

int main() {
    string s;
    cin >> s;

    for (int i = 0; i < s.size(); i++) {
        if (isdigit(s[i])) {
            int x = 0;
            while (i < s.size() && isdigit(s[i])) {
                x = x * 10 + s[i] - '0';
                i++;
            }
            i--;

            num.push(x);
        }

        else if (s[i] == '(')
            stk.push(s[i]);

        else if (s[i] == ')') {
            while (stk.top() != '(') eval();

            stk.pop();
        } else {
            while (stk.size() && h[s[i]] <= h[stk.top()]) eval();
            stk.push(s[i]);
        }
    }
    while (stk.size()) eval();
    printf("%d\n", num.top());
    return 0;
}