#include <fstream>
#include <unordered_map>
#include <stack>
using namespace std;
ifstream fin("evaluare.in");
ofstream fout("evaluare.out");
string expr;
stack<int> st1;
stack<char> st2;
unordered_map<char, int> pr;

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

int operatie(int a, char op, int b) {
    if (op == '+')
        return a + b;
    if (op == '-')
        return a - b;
    if (op == '*')
        return a * b;
    return a / b;
}

void calcul(stack<int>& st1, stack<char>& st2) {
    int b = st1.top();
    st1.pop();
    int a = st1.top();
    st1.pop();
    st1.push(operatie(a, st2.top(), b));
    st2.pop();
}

int main() {
    pr['('] = 0;
    pr['+'] = pr['-'] = 1;
    pr['*'] = pr['/']= 2;
    fin >> expr;
    for (int i = 0; i < expr.size(); i++)
        if (expr[i] >= '0' && expr[i] <= '9')
            st1.push(numar(expr,i));
        else
            if (expr[i] == '(')
                st2.push('(');
            else
                if (expr[i] == ')') {
                    while (st2.top() != '(')
                        calcul(st1, st2);
                    st2.pop();
                }
                else {
                    while (!st2.empty() && pr[st2.top()] >= pr[expr[i]])
                        calcul(st1, st2);
                    st2.push(expr[i]);
                }
    while (!st2.empty())
        calcul(st1, st2);
    fout << st1.top();
    return 0;
}