#define LMAX 100005
#include <fstream>
#include <cstring>
using namespace std;

ifstream f("evaluare.in");
ofstream g("evaluare.out");

char a[LMAX];
char semne[LMAX];
int nre[LMAX];
int top_semne, top_nre;
int l;

bool isDigit(char a)
{
    if(a >= '0' && a <= '9')
        return 1;
    return 0;
}

void push_semne(char semn)
{
    semne[++top_semne] = semn;
}

void push_nre(int nr)
{
    nre[++top_nre] = nr;
}

void formnr(int &i)
{
    int nr = 0;
    while(isDigit(a[i]))
    {
        nr = nr * 10 + (a[i] - '0');
        ++i;
    }
    --i;
    push_nre(nr);
}

void calcul(char c)
{
    int x = nre[top_nre];
    nre[top_nre --] = 0;
    int y = nre[top_nre];
    nre[top_nre --] = 0;
    int rez;

    switch(c)
    {
        case '+':
            rez = y + x;
            break;
        case '-':
            rez = y - x;
            break;
        case '*':
            rez = y * x;
            break;
        case '/':
            rez = y / x;
            break;
    }
    push_nre(rez);
    semne[top_semne--] = 0;

}





int grad(char c)
{
    if(c == '+' || c == '-' || c == ')')
        return 1;
    if(c == '*' || c == '/')
        return 2;
    return 0;
}



/**

pt ), +, - se elibereza TOT pana la (       1 si se opresc in 0
pt *, / se elibereaza TOT pana la (, +, -   2 se opresc in 1, 0
**/



void eliber(char forWho)
{
    int grad_actual = grad(forWho);

    while(top_semne != 0 && grad_actual <= grad(semne[top_semne]))
        calcul(semne[top_semne]);
}





void solve()
{
    for(int i = 0; i < l; ++i)
    {
        if(isDigit(a[i]))
            formnr(i);
        else if(a[i] == '(')
            push_semne(a[i]);
        else if(a[i] == ')')
        {
            if(top_semne != 0)
                eliber(')');
            semne[top_semne --] = 0;
        }
        else{
            if(top_semne != 0)
                eliber(a[i]);
            push_semne(a[i]);
        }

    }
    while(top_semne != 0)
        calcul(semne[top_semne]);
}


int main()
{
    f>>a;
    l = strlen(a);
    solve();
    g<<nre[top_nre];

    return 0;
}