double janek, karol, dlug, rata, splata, dzien;
            janek = 50;
            karol = 40;
            dlug = 80;
            rata = 0.2;
            splata = 0;
            do
            {

              splata += janek * rata;
                Console.WriteLine(splata);


            }
            while (dlug > splata);

            Console.ReadLine();