using System;
using System.Globalization;

public class Test
{
	public static void Main()
	{
    NumberFormatInfo nfi = new CultureInfo( "en-US", false ).NumberFormat;
    nfi.NumberGroupSeparator = ".";
    Int64 myInt = 1234567890;
    Console.WriteLine( myInt.ToString( "N", nfi ) );
	}
}