#include<iostream>
using namespace std;
int main()
{
    if(!(cin>>age)){
        return 0;
    }
    if(age < 0){
        cout<<"Invalid input"<<endl;
    }
    else if( age >= 18){
        cout<<"Eligible"<<endl;
    }
    else {
        cout<<"Not eligible"<<endl;
    }
    return 0;
}