#include <cstdio>
#include <stack>
#include <cstring>
using namespace std;

stack <int>numere;
stack <char>operatii;

char s[100005];

int prioritate(char s1)
{
    if(operatii.empty())
        return 1;
    if(operatii.top()=='(')
        return 1;
    if(s1=='*' && operatii.top()=='+'||s1=='*' && operatii.top()=='-'||s1=='/' && operatii.top()=='+'||s1=='/' && operatii.top()=='-')
        return 1;
    return 0;
}

int calculam(char s1)
{
    int x=numere.top();
    numere.pop();
    int y=numere.top();
    numere.pop();
    if(s1=='+')
    {
        numere.push(x+y);
        return x+y;


    }
     if(s1=='-')
    {
        numere.push(y-x);
        return y-x;


    }
     if(s1=='*')
    {
        numere.push(x*y);
        return x*y;


    }
    if(s1=='/')
    {
        numere.push(y/x);
        return y/x;

    }
}
int main()
{
    freopen("evaluare.in","r",stdin);
    freopen("evaluare.out","w",stdout);
    scanf("%s",s);
    int n=strlen(s);
    for(int i=0; i<n; i++)
    {
        if(operatii.empty() && (s[i]<='0'||s[i]>='9'))
        {
            operatii.push(s[i]);
           // continue;
        }
        else if(s[i]<='9' && s[i]>='0')
        {
            int x=0;
            while(s[i]<='9' && s[i]>='0')
            {
                x=x*10+(s[i]-'0');
                i++;
            }
            i--;
            numere.push(x);
            //continue;
        }
        else if(prioritate(s[i])==1)
        {
            operatii.push(s[i]);
           // continue;
        }
        else if(s[i]=='(')
        {
            operatii.push(s[i]);
            //continue;
        }
        else if(s[i]==')')
        {
            while(operatii.top()!='(')
            {
                char y=operatii.top();
                calculam(y);
                operatii.pop();
            }
            operatii.pop();
            //continue;
        }
        else{while(prioritate(s[i])==0)
        {
            calculam(operatii.top());
            operatii.pop();

        }
        operatii.push(s[i]);}
    }
    while(!operatii.empty())
    {
        char c=operatii.top();
        calculam(c);

        operatii.pop();
    }

    int y=numere.top();
    printf("%d",numere.top());
    return 0;
}