// editor1
int main() {
    int age;
    
    if (scanf("%d", &age) != 1) {
        return 1;
    }
    if (age < 0) {
        printf("Invalid input\n");
    }
    else if (age >= 18) {
        printf("Eligible\n");
    }
    else {
        printf("Not eligible\n");
    }
    return 0;
}