#include<bits/stdc++.h>
using namespace std;
 
int main(){
    int a,b,c;//数字
    string d;//字符
    cin>>a;
    cin>>b;
    cin>>d;
    if(b==0){
        cout<<"Divided by zero!";
    }
    if (d == "+"){
        c=a+b;
        cout<<c;
    }else if (d == "/"){
        c=floor(a/b);
        cout<<c;
    }else if (d == "*"){
        c=a*b;
        cout<<c;
    }else if (d == "-"){
        c=a-b;
        cout<<c;
    }else if (d!="-"||d!="/"||d!="*"||d!="+"){
        cout<<"Invalid operator!";
    }
};