#include <cstdio>
#include <stack>
#include <fstream>
#include <cstdlib>
#include <cstring>
using namespace std;

const int nmx = 100002;

ifstream f("evaluare.in");
ofstream o("evaluare.out");

char s[nmx];
stack <int> stn;
stack <char> sts;

int grad(const char c) {
    if(c == '(' || c == ')')
        return 0;
    if(c == '+' || c == '-')
        return 1;
    return 2;
}

int calcul(int nr1, int nr2, char semn) {
    if(semn == '+')
        return nr1 + nr2;
    if(semn == '-')
        return nr1 - nr2;
    if(semn == '*')
        return nr1 * nr2;
    return nr1 / nr2;
}

void evaluare() {
    size_t m = strlen(s);
    s[m++] = ')';
    char semn;
    int nr1,nr2;
    sts.push('(');
    for(size_t i = 0; i < m; ++i) {
        if(s[i] == '(') {
            sts.push('(');
            continue;
        }
        if(isdigit(s[i])) {
            int nr = 0;
            while(isdigit(s[i])) {
                nr = nr * 10 + (int)s[i] - 48;
                ++ i;
            }
            stn.push(nr);
            -- i;
            continue;
        }
        if(s[i] == ')') {
            while(sts.size() && sts.top() != '(') {
                semn = sts.top();
                sts.pop();
                nr2 = stn.top();
                stn.pop();
                nr1 = stn.top();
                stn.pop();
                stn.push(calcul(nr1,nr2,semn));
            }
            continue;
        }
        while(sts.size() && grad(s[i]) <= grad(sts.top())) {
            semn = sts.top();
            sts.pop();
            nr2 = stn.top();
            stn.pop();
            nr1 = stn.top();
            stn.pop();
            stn.push(calcul(nr1,nr2,semn));
        }
        sts.push(s[i]);
    }
}

int main() {
    f >> s;
    evaluare();
    o << stn.top();
    return 0;
}