// 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;
    }
    return 0;
}