// editor3
#include<iostream>
using namespace std;
 class ClassFullException{
     
     
 };
int main(){
    int availableSlots,studentsEnrolling;
    
    if(!(cin>> availableSlots>>studentsEnrolling)) return 0;
    
    try{
        
     if(availableSlots < 0 || studentsEnrolling < 0){
         cout<<"Invalid input"<<endl;
         cout<<"Enrollment successful";
         }
    }
     else if(studentsEnrolling > availableSlots){
        throw ClassFullException();
        cout<<"Enrollment successful";
      }
     else{
            cout<<"Enrollment successful"<<endl;
        }
    }
    catch(ClassFullException& e){
        cout<<"Error: Insufficient Slots"<<endl;
    }
    
    return 0;
}