using System;

public class Program

{

    public static void Main()

    {

        int j = 5;

​

        switch (j)

        {

            case 5:

                Console.WriteLine(5);

                switch (j - 1)

                {

                    case 4:

                        Console.WriteLine(4);

                        switch (j - 2)

                        {

                            case 3:

                                Console.WriteLine(3);

                                break;

                        }

                        break;

                }

                break;

            case 10:

                Console.WriteLine(10);

                break;

            case 15:

                Console.WriteLine(15);

                break;

            default:

                Console.WriteLine(100);

                break;

        }

    }

}