#include <iostream>
#include <stack>
#include <cstring>
#include <fstream>
using namespace std;

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

char s[100001];
stack <char> operatori;
stack <int> operanzi;

int formare_nr(char a[], int st, int dr)
{
    int nr = 0;
    for(int i = st; i <= dr; ++i)
        nr = nr * 10 + (a[i] - '0');
    return nr;
}

int prioritate(char c)
{
    if(c == '+')
        return -1;
    if(c == '-')
        return 0;
    if(c == '*')
        return 1;
    if(c == '/')
        return 2;
    return 3;
}

int pot(char deja, char adaug)
{
    if(prioritate(deja) > prioritate(adaug) && prioritate(deja) != 3)
        return 0;
    return 1;
}

int calcul(int x, int y, char c)
{
    if(c == '+')
        return x + y;
    if(c == '-')
        return x - y;
    if(c == '*')
        return x * y;
    return x / y;
}

int evaluare()
{
    int l = strlen(s);
    for(int i = 0; i < l; ++i)
    {
        //cout << s[i] << ' ';
        if(operatori.empty() && !isalnum(s[i]))
            operatori.push(s[i]);
        else if(s[i] >= '0' && s[i] <= '9')
        {
            int st = i, dr;
            for(dr = i + 1; isalnum(s[dr]); ++dr);
            dr--;
            int nr = formare_nr(s, st, dr);
            operanzi.push(nr);
            i = dr;
        }
        else if(s[i] == ')')
        {
            if(operatori.top() == '(')
                operatori.pop();
            else
            {
                while(!operatori.empty() && operatori.top() != '(')
                {
                    int x = operanzi.top();
                    operanzi.pop();
                    int y = operanzi.top();
                    operanzi.pop();
                    char c = operatori.top();
                    operatori.pop();
                    int rez = calcul(y, x, c);
                    operanzi.push(rez);
                }
                operatori.pop();
            }
        }
        else
        {
            if(pot(operatori.top(), s[i]))
                operatori.push(s[i]);
            else
            {
                while(!operatori.empty() && pot(operatori.top(), s[i]) == 0)
                {
                    int x = operanzi.top();
                    operanzi.pop();
                    int y = operanzi.top();
                    operanzi.pop();
                    char c = operatori.top();
                    operatori.pop();
                    int rez = calcul(y, x, c);
                    operanzi.push(rez);
                }
                operatori.push(s[i]);
            }
        }
    }

    int rez = operanzi.top();
    while(!operatori.empty())
    {
        int x = operanzi.top();
        operanzi.pop();
        int y = operanzi.top();
        operanzi.pop();
        char c = operatori.top();
        operatori.pop();
        rez = calcul(y, x, c);
        operanzi.push(rez);
    }

    return rez;
}

int main()
{
    fin.getline(s, 100001);
    fout << evaluare();
    return 0;
}