#include <iostream>
#include <fstream>
#include <stack>
#include <cstring>
using namespace std;
ifstream f ("evaluare.in");
ofstream g ("evaluare.out");
stack <int> nr;
stack <char> operatori;
int lungime;
char sir[100001];
int putere(char semn)
{
    if(semn == '+' || semn == '-')
        return 1;
    if(semn == '*' || semn == '/')
        return 2;
    return 0;
}
int compune_nr(int &indice)
{
    int nr = 0;
    while(indice<lungime && isdigit(sir[indice]))
    {
        nr = (sir[indice]-'0') + nr*10;
        indice++;
    }
    return nr;
}
int calc_dupa_semn(int nr1,int nr2,char op)
{
    // impartirea se ia invers doeoarece daca noi avem 10/2 , nr1 va fi 2 si nr2 va fi 10 , la fel si la scadere
    if(op == '+')
        return nr1+nr2;
    if(op == '-')
        return nr2-nr1;
    if(op == '*')
        return nr1*nr2;
    if(op == '/')
        return nr2/nr1;
}
int calculeaza_si_da_push()
{
    char op = operatori.top();
    operatori.pop();
    int nr1 = nr.top();
    nr.pop();
    int nr2 = nr.top();
    nr.pop();
    nr.push(calc_dupa_semn(nr1,nr2,op));
}
int main()
{
    f.getline(sir,100001);
    lungime = strlen(sir);
    for(int i = 0; i<lungime; i++)
    {
        if(sir[i] == ' ')
            continue;
        if(sir[i] == '(')
        {
            operatori.push('(');
        }
        if(isdigit(sir[i]))
        {
            nr.push(compune_nr(i));
            if(i==lungime)
                break;
        }
        if(sir[i] == ')')
        {
            while(!operatori.empty() && operatori.top()!='(')
            {
                calculeaza_si_da_push();
            }
            operatori.pop();
        }
        if(!isdigit(sir[i]) && sir[i]!='(' && sir[i]!=')')
        {
            int putere_curent = putere(sir[i]);
            while(!operatori.empty() && putere_curent<= putere(operatori.top()) )
            {
                calculeaza_si_da_push();
            }
            operatori.push(sir[i]);
        }


    }
    while(!operatori.empty() && operatori.top()!= '(')
    {
        calculeaza_si_da_push();
    }
    g << nr.top();
}