#include <bits/stdc++.h>

using namespace std;

ifstream fin ("evaluare.in");
ofstream fout ("evaluare.out");

stack <int> s;
string str, expr;

void opp (int & idx)
{
    while (str[idx] >= '0' && str[idx] <= '9') {
        expr += str[idx];
        idx ++;
    }
    expr += ' ';
    idx --;
}

int priority (int i)
{
    if (str[i] == '*' || str[i] == '/') return 2;
    if (str[i] == '+' || str[i] == '-') return 1;
    return 0;
}

void formaPoloneza (int n)
{
    for (int i = 0; i < n; i ++) {
        if (str[i] >= '0' && str[i] <= '9') opp(i);
        else if (priority(i) != 0) {
            if (s.empty()) s.push(i);
            else {
                while (!s.empty() && priority(s.top()) >= priority(i)) {
                    expr += str[s.top()], s.pop();
                }
                s.push(i);
            }
        }
        else {
            if (str[i] == '(') s.push(i);
            else {
                while (!s.empty() && str[s.top()] != '(') expr += str[s.top()], s.pop();
                if (!s.empty() && str[s.top()] == '(') s.pop();
            }
        }
    }
    while (!s.empty()) expr += str[s.top()], s.pop();
}

int strToInt (int & idx)
{
    int nr = 0;
    while (expr[idx] <= '9' && expr[idx] >= '0') nr = nr * 10 + (expr[idx] - '0'), idx ++;
    idx --;
    return nr;
}

int expresie (int i, int o1, int o2)
{
    if (expr[i] == '+') return o1 + o2;
    else if (expr[i] == '-') return o1 - o2;
    else if (expr[i] == '/') return o1 / o2;
    else return o1 * o2;
}

int evaluare (int n)
{
    int o1, o2;
    while (!s.empty()) s.pop();
    for (int i = 0; i < n; i ++) {
        if (expr[i] >= '0' && str[i] <= '9') s.push(strToInt(i));
        else if (expr[i] != ' ' && s.size() >= 2) {
            o1 = s.top(), s.pop();
            o2 = s.top(), s.pop();
            s.push(expresie(i, o2, o1));
        }
    }
    return s.top();
}

int main()
{
    getline(fin, str);
    int n = str.size();
    formaPoloneza(n);
    fout << evaluare(expr.size());
    return 0;
}