using System;

public class Program

{

    public static void Main()

    {

        double number1 = 10000000,

               number2 = 10000000.234,

               number3 = 10000000.05;

        Console.WriteLine(number1.ToString("##,#0.##"));

        Console.WriteLine(number2.ToString("##,#0.##"));

        Console.WriteLine(number3.ToString("##,#0.##"));

    }

}