#include <fstream>

using namespace std;

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

const int N = 100000;

char s[N + 1];
int expresie();
int factor();
int termen();
int p;

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 sign = 1,val = 0;
    while(s[p] == '-')
    {
        p ++;
        sign = -sign;
    }
    if(s[p] == '(')
    {
        p ++;
        val = expresie();
        p ++;
        return sign * val;
    }
    while(s[p] >= '0' && s[p] <= '9')
    {
        val = val * 10 + (s[p] - '0');
        p ++;
    }
    return sign * val;
}

int main()
{
    in >> s;
    out << expresie();
    return 0;
}