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

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

char exp[100100], *p = exp, op[2][4] = {"+-", "*/"};
//int grad = 0;

void citire()
{
    fin>>exp;
}

int operatie(int a, int b, char c)
{
    if(c == '+') return a + b;
    if(c == '-') return a - b;
    if(c == '*') return a * b;
    if(c == '/') return a / b;
}

int expresie(int grad)
{
    int x = 0, y;
    if(grad > 1)
        {
            if(*p >= '0' && *p <= '9')
                {
                    while(*p >= '0' && *p <= '9')
                        {
                            x = x * 10 + (*p - '0');
                            ++p;
                        }
                    return x;
                }
            else
                {
                    p++;
                    x = expresie(0);
                    p++;
                }
        }
    else
        {
            x = expresie(grad + 1);
            while(grad == 0 && (*p == '+' || *p == '-') || (*p == '*' || *p == '/'))
                {
                    p++;
                    y = operatie(x, expresie(grad + 1), *(p - 1));
                    x = y;
                }
        }
    return x;
}

int main()
{
    citire();
    fout<<expresie(0);
    return 0;
}