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