using System;

public class Program

{

    public static void Main()

    {

        var valueDateDay = 1000;

        Console.WriteLine(valueDateDay.ToString(valueDateDay.ToString().Length > 4 ? "N0" : "C2"));

        valueDateDay = 100000;

        Console.WriteLine(valueDateDay.ToString(valueDateDay.ToString().Length > 4 ? "N0" : "C2"));

    }

}