#include <iostream>
#include <fstream>

using namespace std;

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

const int N = 100000;
char s[N+1];
int p;
int expresie();
int termen();
int factor();
int expresie() {
    int sum  = termen();
    while ( s[p] == '+' || s[p] == '-' )
    {
        if ( s[p] == '+' )
        {
            p++;
            sum += termen();
        } else {
            p++;
            sum -= termen();
        }
    }
    return sum;
}

int termen() {
    int prod = factor();
    while ( s[p] == '*' || s[p] == '/' )
    {
        if ( s[p] == '*' )
        {
            p++;
            prod *= factor();
        } else {
            p++;
            prod /= factor();
        }
    }
    return prod;
}

int factor() {
    int semn = 1, val = 0;
    while ( s[p] == '-' )
    {
        p++;
        semn = -semn;
    }
    if ( s[p] == '(' )
    {
        p++;
        val = expresie();
        p++;
        return semn * val;
    }
    while ( isdigit(s[p]) )
        val = val * 10 + ( s[p++] - '0' );
    return semn * val;
}

int main()
{
    int i = 0;
    while ( fin.get(s[i]) )
        i++;
    fout << expresie();
    return 0;
}