using System;
using System.Globalization;
public class MainClass
{
public static void Main()
{
double value = 1234567890;
Console.WriteLine(value.ToString("#,#", CultureInfo.InvariantCulture));
Console.WriteLine(value.ToString("#,#", CultureInfo.CreateSpecificCulture("el-GR")));
}
}
/*
1,234,567,890
1.234.567.890
*/