using System;

​

public class Program

{

    public static void Main()

    {

        int grade = 4;

        switch (grade)

        {

            case 4:case 3:case 2:case 1:

                Console.WriteLine("pass");

                break;

            case 0:

                Console.WriteLine("fail");

                break;

            default:

                Console.WriteLine("illegal");

                break;

        }

    }

}