#include <bits/stdc++.h>

using namespace std;
string s;
int n, i = 0;
ifstream fin("evaluare.in");
ofstream fout("evaluare.out");

/*
expresie = suma de termeni
termen = produs de factori
factor = constanta/valoare sau expresie
*/
int factor();
int termen();

int expresie()
{
    int sum;
    sum = termen();
    while(s[i] == '+' || s[i] == '-')
    {
        if(s[i] == '+')
        {
            i++;
            sum += termen();

        }
        else
        {
            i++;
            sum -= termen();
        }
    }
    return sum;
}

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

int factor()
{
    int val = 0, semn = 1;
    while(s[i] == '-')
    {
        i++;
        semn = -semn;
        // modificarea semnului
    }
    /// ----

    /// avem expresie si ne folosim de functia de mai sus
    if(s[i] == '(')
    {
        i++;
        val = expresie();
        i++;
        return val * semn;
    }
    /// avem valoare constnta si formam numarul
    while(isdigit(s[i]) == true)
    {
        val = val * 10 + (s[i] - '0');
        i++;
    }
    return val * semn;
}

int main()
{
    fin >> s;
    fout << expresie();
    return 0;
}