#include<bits/stdc++.h>
#define yy return 0;
using namespace std;
int main() { 
    int a,b;
    char c; 
    cin>>a>>b>>c;
    if(c=='+') cout<<a+b; 
    else if(c=='-') cout<<a-b; 
    else if(c=='*') cout<<a*b;
    else if(c=='/') { 
        if(b==0) cout<<"Divided by zero!"; 
        else cout<<a/b;
    } 
    else cout<<"Invalid operator!";
    yy
}