using System;

public class Program

{

    public static void Main()

       {

            int k= 1;

            while (k==1)

            {

                int n,i, suma;

                double masa , c;

                Console.WriteLine("Masa cegly 2.5 kg");

                Console.WriteLine ("Podaj ilosc warstw : ");

                n = int.Parase(Console,ReadLine());

                suma =0;

                c=2.5;

                i=n;

                while (i>=1)

                {

                    suma=suma+i;

                    i=i-i;

                }

                masa=suma*c;

                Console.WriteLine("Ilosc cegiel : "+ suma);

                Console.WriteLine("Waga muru: {0:f2}",masa);

                Console.WriteLine ('Liczymy dalej 0/1:");

                k= intParase(Console.ReadLine());

      }

}