using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine(calc(new System.DateTime(2022, 6, 1)));

        Console.WriteLine(calc(new System.DateTime(2022, 6, 24)));

        Console.WriteLine(calc(new System.DateTime(2023, 1, 22)));

    }

​

    public static string calc(DateTime x)

    {

        return x.Day <= 22 ? x.AddMonths(-1).ToString("MMMM, yyyy") : x.ToString("MMMM, yyyy");

​

    }

}