#include
using namespace std;
int main() {
char ch;
cin>>ch;
long long int N1;
cin>>N1;
long long int N2;
cin>>N2;
while(ch!=‘x’ and ch!=‘X’){
switch(ch){
case ‘+’:
cout<<N1+N2<<endl;
break;
case ‘-’:
cout<<N1-N2<<endl;
break;
case '’:
cout<<N1N2<<endl;
break;
case ‘/’:
cout<<N1/N2<<endl;
break;
case ‘%’:
cout<<N1%N2<<endl;
break;
default:
cout<<"Invalid operation. Try again. "<<endl;
}
}
return 0;
}