#include <iostream>
#include <fstream>
#include <stack>

using namespace std;

int numar(char x)
{
    return x-48;
}

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

int grad(char x)
{
    if (x=='+')
        return 1;
    if (x=='-')
        return 1;
    if (x=='*')
        return 2;
    if (x=='/')
        return 2;
    if (x=='(')
        return 3;
    return 4;
}

int main()
{
    ifstream fin("evaluare.in");
    ofstream fout("evaluare.out");
    stack <int> numere;
    stack <char> operatori;
    char a[100010];
    int i;
    fin.getline(a, 100010);
    for (i=0; a[i]; i++)
    {
        if (isdigit(a[i]))
        {
            int num=0;
            while(isdigit(a[i]))
            {
                num=num*10+numar(a[i]);
                i++;
            }
            numere.push(num);
            i--;
        }
        else
        {
            if (grad(a[i])==4)
            {
                int rez;
                rez=numere.top();
                numere.pop();
                while(operatori.top()!='(')
                {
                    rez=calcul(numere.top(), rez, operatori.top());
                    numere.pop();
                    operatori.pop();
                }
                operatori.pop();
                numere.push(rez);
            }
            else
            {
                if (operatori.empty()==0)
                {
                    if (grad(operatori.top())==2 && grad(a[i])==1)
                    {
                        int rez;
                        rez=numere.top();
                        numere.pop();
                        while (grad(operatori.top())>1)
                        {
                            rez=calcul(numere.top(), rez, operatori.top());
                            numere.pop();
                            operatori.pop();
                            if (operatori.empty())
                                break;
                        }
                        numere.push(rez);
                        operatori.push(a[i]);
                    }
                    else
                    {
                        if (operatori.empty()==0)
                        {
                            if ((a[i]=='/' && operatori.top()=='/') || (a[i]=='-' && operatori.top()=='-'))
                            {
                                int rez=numere.top();
                                numere.pop();
                                rez=calcul(numere.top(), rez, operatori.top());
                                operatori.pop();
                                numere.push(rez);

                            }
                        }
                        operatori.push(a[i]);
                    }
                }
                else
                {
                    if (operatori.empty()==0)
                    {
                        if ((a[i]=='/' && operatori.top()=='/') || (a[i]=='-' && operatori.top()=='-'))
                        {
                            int rez=numere.top();
                            numere.pop();
                            rez=calcul(numere.top(), rez, operatori.top());
                            operatori.pop();
                            numere.push(rez);
                        }
                    }
                    operatori.push(a[i]);
                }
            }
        }
    }
    int rez;
    rez=numere.top();
    numere.pop();
    while(operatori.empty()==0)
    {
        rez=calcul(numere.top(), rez, operatori.top());
        numere.pop();
        operatori.pop();
    }
    fout << rez;
    return 0;
}