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