#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <vector>
#include <stack>
#include <queue>
#include <deque>
#include <map>
#include <cmath>
using namespace std;

const int N = 1e5;

char sti[5 + N];
int sir[5 + N];
int v[5 + N];

bool is_operator(char ch) {
    return (ch == '+' || ch == '-' || ch == '*' || ch == '/');
}

int rang(char ch) {
    if(ch == '+' || ch == '-') return 1;
    return 2;
}

int operator_to_int(char ch) {
    if(ch == '+') return -1;
    if(ch == '-') return -2;
    if(ch == '*') return -3;
    if(ch == '/') return -4;
}

int main() {
    freopen("evaluare.in","r",stdin);
    freopen("evaluare.out","w",stdout);
    char ch(' '), chprev(' ');
    int vf(0), nr(0);
    while(ch != '\n') {
        ch = getchar();
        if(ch != '\n') {
            if(ch == '(') sti[++vf] = '(';
            else if(ch == ')') {
                if(chprev >= '0' && chprev <= '9') sir[++sir[0]] = nr;
                while(vf > 0 && sti[vf] != '(') {
                    sir[++sir[0]] = operator_to_int(sti[vf]);
                    vf--;
                }
                vf--;
                nr = 0;
            } else if(is_operator(ch)) {
                if(chprev >= '0' && chprev <= '9') sir[++sir[0]] = nr;
                while(vf > 0 && sti[vf] != '(' && rang(sti[vf]) >= rang(ch)) {
                    sir[++sir[0]] = operator_to_int(sti[vf]);
                    vf--;
                }
                sti[++vf] = ch;
                nr = 0;
            } else
                nr = nr * 10 + ch - '0';
            chprev = ch;
        }
    }
    if(nr > 0) sir[++sir[0]] = nr;
    nr = 0;
    while(vf > 0) {
        sir[++sir[0]] = operator_to_int(sti[vf]);
        vf--;
    }

    vf = 0;
    for(int i = 1; i <= sir[0]; i++){
        if(sir[i] < 0){
            if(sir[i] == -1)
                v[vf - 1] += v[vf];
            else if(sir[i] == -2)
                v[vf - 1] -= v[vf];
            else if(sir[i] == -3)
                v[vf - 1] *= v[vf];
            else if(sir[i] == -4)
                v[vf - 1] /= v[vf];
            vf--;
        }
        else v[++vf] = sir[i];
    }
    printf("%d\n", v[1]);
    return 0;
}