/* Search your notes :) */
#include <stdio.h>
#include <string.h>
using namespace std;

char sir[100001], stack[10001];
int output[100001], stiva[100001], used[100001], prior[100];
int n, i, j, nr;
int primul, varf;

void initializare ()
{
    prior['('] = prior[')'] = 4;
    prior['+'] = prior['-'] = 1;
    prior['*'] = prior['/'] = 2;
}

void afisare_RPN ()
{
    for (i=1; i<=primul; ++i)
        if (used[i])
            printf ("%c ", output[i]);
        else
            printf ("%d ", output[i]);
    printf ("\n\n");
}

int is_sign (char x)
{
    if (x == '+' || x == '-' || x == '*' || x == '/')
        return 1;
    return 0;
}

int main ()
{
    FILE *f = fopen ("evaluare.in","r");
    FILE *g = fopen ("evaluare.out","w");
    fscanf (f,"%s", sir);

    initializare ();

    i = 0;
    while (sir[i] != '\0')
    {
        if (sir[i] >= '0' && sir[i] <= '9')
        {
            while (sir[i] >= '0' && sir[i] <= '9')
            {
                nr = nr * 10 + sir[i] - '0';
                i ++;
            }
            i --;
            primul ++;
            output[primul] = nr;
            nr = 0;
        }
        else if (sir[i] == '(')
        {
            varf ++;
            stack[varf] = '(';
        }
        else if (sir[i] == ')')
        {
            while (stack[varf] != '(')
            {
                primul ++;
                output[primul] = stack[varf];
                stack[varf] = 0;
                if (is_sign (output[primul]))
                    used[primul] = 1;
                varf --;
            }
            stack[varf] = 0;
            varf --;
        }
        else if (is_sign (sir[i]))
        {
            while (prior[sir[i]] <= prior[stack[varf]] && prior[stack[varf]] != prior['(']) /* while !!! - cat timp gaseste <= scoate */
            {
                primul ++;
                output[primul] = stack[varf];
                if (is_sign (output[primul]))
                    used[primul] = 1;
                stack[varf] = sir[i];
                varf --;
            }
            varf ++;    /* apoi bagam asta in stiva */
            stack[varf] = sir[i];
        }
        i ++;
    }
    while (varf)
    {
        primul ++;
        output[primul] = stack[varf];
        if (is_sign (output[primul]))
            used[primul] = 1;
        varf --;
    }

    varf = 0;
    for (i=1; i<=primul; ++i)
    {
        if (used[i])
        {
            if (output[i] == '+')
                stiva[varf-1] += stiva[varf];
            else if (output[i] == '-')
                stiva[varf-1] -= stiva[varf];
            else if (output[i] == '*')
                stiva[varf-1] *= stiva[varf];
            else if (output[i] == '/')
                stiva[varf-1] /= stiva[varf];
            varf --;
        }
        else
        {
            varf ++;
            stiva[varf] = output[i];
        }
    }

    fprintf (g, "%d\n", stiva[1]);

    fclose (g);
    fclose (f);
    return 0;
}