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