#include
using namespace std;
int main() {
char ch;
cin>>ch;
int N1;
int N2;
while(ch == ‘X’ || ch ==‘x’){
cin>>N1>>N2;
int N;
if(ch ==’+’ || ch ==’-’|| ch == ‘*’ || ch == ‘/’ || ch== ‘%’){
N = N1 N2;
cout<< N <<endl;
}
else{
cout<<"Invalid operation. Try again. ";
}
}
return 0;
}