#include<stdio.h>
int main()
{
    int age;
    scanf("%d",&age);
    if (age < 0)
    {
        printf("Invalid input \n");
    }
    else if(age >= 18)
    {
        printf("Eligibel \n");
    }
    elsre 
    {
        printf("Not eligible \n");
    }
    return 0;
}