#include
using namespace std;
int main() {
char ch;
int c,N1,N2;
do {
cin>>ch;
switch(ch)
{
case '+':
cin>>N1>>N2;
c=N1+N2;
cout<<c;
break;
case '-':
cin>>N1>>N2;
c=N1-N2;
cout<<c;
break;
case '*':
cin>>N1>>N2;
c=N1*N2;
cout<<c;
break;
case '/':
cin>>N1>>N2;
c=N1/N2;
cout<<c;
break;
case '%':
cin>>N1>>N2;
c=N1%N2;
cout<<c;
break;
case 'X':
case 'x':
exit(42);
default:
cout<<" 'Invalid operation. Try again.'";
}
} while(ch='X');
return 0;
}