// editor2
#include<stdio.h>
int main()
{
    int age;
    scanf("%d", &age);
    if (age < 0)
    {
    printf("Invalid input\n");
    }
    else if (age>=18)
    { 
        print("Eligible\n");
    }
    else
    {
        printf("Not eligible\n");
    }
    return 0;
}