#include <stdio.h>
int main()
{
    int a;
    scanf("%d",&a);
    if(a>18)(a=18)
    {
        printf("a is eligible ")
    }
    else(a<18)
    {
        printf("a is not eligible")
    }
    else if{
        printf("a is invalid input")
    }
    return 0;
}