#include <fstream>
#include <cstring>
using namespace std;
ifstream cin("evaluare.in");
ofstream cout("evaluare.out");
const int N = 300001;
char c[N];
int stiva [100001], vf;
int prio(char x)
{
    if(x == '(' or x == ')')
        return 0;
    if(x == '+' or x == '-')
        return 1;
    return 2;
}
int operatie( int x, int y , char semn)
{
    switch(semn)
    {
        case '+': return x + y;
        case '-': return x - y;
        case '*': return x * y;
        case '/': return x / y;
    }
}
int eval(char []);
void postfix(char[]);
int main()
{
    cin >> c;
    postfix(c);
    cout << eval(c);
    return 0;
}
void postfix(char x[])
{
    int poz = 0;
    int n = strlen(x);
    char aux[N]= {0};
    for( int i =0 ;i < n ;i ++)
    {
        if(x[i] >='0' and x[i]<='9')
            aux[poz++]=x[i];
        else
        {
            if(i > 0 and x[i-1]>='0' and x[i -1]<='9')
                aux[poz++]= ' ';
            if(x[i] == '(')
                stiva[vf++]= x[i];
            else
                if(x[i] == ')')
            {
                while(stiva[vf - 1] !='(')
                    aux[poz++] = stiva[--vf];
                vf--;
            }
            else
            {
                while(vf != 0 and prio(x[i]) <= prio(stiva[vf- 1]))
                    aux[poz ++]= stiva[--vf];
                stiva[vf++] = x[i];
            }

        }
    }
    if(aux[poz - 1] >='0' and aux[poz - 1] <='9')
        aux[poz++] = ' ';
    while(vf != 0)
    {

        aux[poz++] = stiva[--vf];
    }
    strcpy(x, aux);
}
int eval(char x[])
{
    int n = strlen(x);
    int numar = 0;
    for( int i =0 ; i < n ;i++)
        if(x[i] >='0' and x[i]<='9')
            numar = numar * 10 +x[i] -'0';
        else
            if(x[i] == ' ')
        {
            stiva[vf++] = numar;
            numar = 0;
        }
        else
        {
            int nr2 = stiva[--vf], nr1= stiva[--vf];
            stiva[vf++] = operatie(nr1,nr2, x[i]);
        }
    return stiva[vf - 1];
}