using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World"+new X{RawMonth =72}.ResolvedMonth);

    }

}

​

class X{

public int RawMonth {get;set;}

​

​

public int ResolvedMonth { get =>

RawMonth switch

{

  (>=1) and (<=12) => RawMonth,

  (>=21) and (<=32) => RawMonth-20,

  (>=51) and (<=62) => RawMonth-50,

  (>=71) and (<=82) => RawMonth-70,

        _=> throw new Exception("")

};

                         }

}

​

​