#include <iostream>
using namespace std;
class fullexception{};
int main(){
    int available slots,students;
    cin>>availableslots;
    cin>>studets;
    if(availableslots<0||students<0){
        cout<<"Invalid input";
        return 0;
    }
    try{
        if (studebts>availableslots){
            throw fullexception();
        }
        cout<<"Enrollment successful";
    }
    catch(fullexception){
        cout<<"Error:Insufficient Slots";
    }
    return 0;
}