#include <iostream>
#include <cstdio>
#include <fstream>
#include <string.h>

#define maxn 100000

using namespace std;



char oper[4][4]={"+-","/*","",""};

struct nod
{
    char c;
    int val;

    nod* s;
    nod* d;

    nod(char a=0, int b=0, nod *q=0, nod *v=0) :
        c(a), val(b), s(q), d(v){}
}*r;

char buff[maxn];
char *p;

int numerizare()
{
    int num;
    for(num=0;(*p<='9')&&(*p>='0'); p++)
    {
        num = num*10 + *p - '0';
    }
    return num;
}

void citire()
{
    fgets(buff, maxn,stdin);
    p=buff;
}

nod *construire(int niv)
{
        nod *fin, *aux;


        if(niv==2)

            if(*p=='(')
            {
                p++;
                fin=construire(0);
                p++;
            }
            else
            {
                fin=new nod(0,numerizare(),0,0);
               // g<<fin->val;
            }



        else
        {
           fin=construire(niv+1);
           while(strchr( oper[niv], *p ))
            {
            aux=new nod(*p++, 0, fin,   construire(niv+1));
            fin=aux;
            }

        }
        return fin;

}

int explore(nod* n)
{
    switch(n->c)
    {
        case '+':return explore(n->d) + explore(n->s);
        case '*':return explore(n->d) * explore(n->s);
        case '-':return explore(n->s) - explore(n->d);
        case '/':return explore(n->s) / explore(n->d);
        default:return n->val;
    }
}

int main()
{
    freopen( "evaluare.in", "r", stdin );
    freopen( "evaluare.out", "w", stdout );
    citire();
    r=construire(0);
    printf("%d  \n",explore(r));
    return 0;
}