using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp13
{
    class Program
    {
        static void Main(string[] args)
        {
            Alku:
            String Username = "Marko";
            String Pass = "kala";


            Console.WriteLine("Anna käyttäjänimi:");
            Username = Console.ReadLine();

            Console.WriteLine("Anna Salasana:");
            Pass = Console.ReadLine();

            if (Username == "Marko" && Pass == "kala")
            Console.WriteLine("Okein !");
            else
            {
                Console.WriteLine("Ooobs ! Try again ?");
                string vastaus;

                vastaus = Console.ReadLine();
                if (vastaus == "yes")
                    goto Alku;
            }
        }
    }
}