using System;

public class Program

{

    public static void Main()

    {

        int sum=0;

        int i=0;

        int x=0;

        int y=1;

        for (i = 1; i < 4000000; i=x+y)

        {

            Console.WriteLine(i);

            if (x >= y)

            {

                y = x + y;

            }

            else

            {

                x = x + y;

            }

​

            if ((x+y)%2==0)

            {

                Console.WriteLine("Dodaje do sumy " + (x+y) + ". Suma wynosi teraz " + (sum+=x+y) + ".");

            }

        }

    }

}