#include <iostream>
using namespace std;
long long x,y,v;
char z;
int main()
{
    cin>>x>>y>>z;
    if(z=='+')
    {
        v=x+y;
        cout<<v;
        return 0;
    }
    else if(z=='-')
    {
        v=x-y;
        cout<<v;
        return 0;
    }
    else if(z=='*')
    {
        v=x*y;
        cout<<v;
        return 0;
    }
    else if(z=='/')
    {
        if(x==0)
        {
            cout<<"Divided by zero!";
            return 0;
        }
        v=x/y;
        return 0;
    }
    else
    {
        cout<<"Invalid operator!";
        return 0;
    }
    return 0;
}