#include<iostream>
using namespace std;
int main() {
 long int n1,n2;
 char ch;
 cin>>ch;

do{

if(ch=='+'||ch=='-'||ch=='*'||ch=='/'||ch=='%')
{
   cin>>n1>>n2;
   switch(ch)
   {
      case '+':
	  {
		  cout<<n1+n2<<endl;
		  break;
	  }
      case '-':
	  {
		  cout<<n1-n2<<endl;
		  break;
	  }
      case '*':
	  {
		  cout<< n1*n2 << endl;
		  break;
	  }
	  case '/':
	  {
		  if(n2==0)
		  {
			ch>>ch;
			continue;
		  }
		  cout<<n1/n2<<endl;
		  break;
	  }
    case '%':
	{
      if(n2==0)
	  {
		  cin>>ch;
		  continue;
	  }
       cout<<n1%n2<<endl;
	   break;
	}
   }
}

else if (ch=='x'||ch=='X')
{
	return 0;
}
else
{cout<<"Invalid operation. Try again";
  cin>>ch;
  continue;
}

cin>>ch;

	}while(ch!='x'||ch!='X');

	return 0;
}