using System;

public class Program

{

    public static void Main()

    {

        var timestamp = ((long)DateTime.Now.Subtract(new DateTime(1970, 1, 1)).TotalMilliseconds).ToString();

                var length = timestamp.Length;

                var result = timestamp.Substring(0, length - 2).Substring(length - 10);

        Console.WriteLine(result);

    }

}