import java.util.Scanner;
class Example2 {
    public static void main(String args[]) {

        Scanner sc = new Scanner(System.in);
        int age = 0;
        boolean finish = false;
        while (finish == false) {
            System.out.print("Input age:");
            age = sc.nextInt();
            if (age < 0 || age > 120) {
                System.out.println("Invalid");
            } else {
                System.out.println("Good");
                finish = true;
            }
        }
    }
}