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