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