#include <iostream>
using namespace std;
int main(){
int a,b;
char s;
cin>>a>>b>>s;
if(s=='/'&&b0){
cout<<"Divided by zero!";
return 0;
}
if(s'+'){
cout<<a+b;
}else if(s=='-'){
cout<<a-b;
}else if(s==''){
cout<<ab;
}else if(s=='/'){
cout<<a/b;
}
return 0;
if(s!='+'||'-'||'*'||'/'){
cout<<"Invalid operator!";
return 0;
}
return 0;
}
