// editor2
#include<iostream>
using namespace std;

void age_check(int age){
    if (age>=18)
    cout<<"Eligible";
    }
 else if (age<0){
    cout<<"Invalid input";
 }
 else{
    cout<<"Not eligible";
 }
}
int main(){
    int age;
    cin>>age;
    age_check(age);
}