using System;

public class Program

{

    public static void Main()

    {

        decimal i = 20.5M;

​

        switch (i)

        {

            case decimal n when (n > 80):

                Console.WriteLine($"Excellent");

                break;

​

            case decimal n when (n > 60 && n <= 80):

                Console.WriteLine($"Good");

                break;

            case decimal n when (n > 40 && n <= 60):

                Console.WriteLine($"Average");

                break;

            case decimal n when (n > 20 && n <= 40):

                Console.WriteLine($"Fair");

                break;

​

            default:

                Console.WriteLine($"Poor");

                break;

        }

    }

}