#include<iostream>
#include<string>
#include<unordered_map>
#include<stack>
using namespace std;

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

void cul() {
    int x = num.top();
    num.pop();
    int y = num.top();
    num.pop();
    char symbol = opt.top();
    opt.pop();
    int z = 0;
    if (symbol == '+') z = y + x;
    if (symbol == '-') z = y - x;
    if (symbol == '*') z = y * x;
    if (symbol == '/') z = y / x;
    num.push(z);
}

int main() {
    string s;
    cin >> s;
    for (int i = 0; i < s.size(); i ++ ) {
        //先处理num
        if (isdigit(s[i])) {
            int j = i, x = 0;
            while(j < s.size() && isdigit(s[j])) {
                x = x * 10 + s[j] - '0';
                j ++ ;
            }
            num.push(x);
            i = j - 1;
        }
        else if (s[i] == '(') {
            opt.push(s[i]);
        }
        else if (s[i] == ')') {
            while(opt.top() != '(') cul();
            opt.pop();
        }
        //处理符号
        else {
            while(opt.size() && h[opt.top()] >= h[s[i]]) {
                cul();
            }
            opt.push(s[i]);
        }
    }
    while(opt.size()) cul();
    cout << num.top() << endl;

}