using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello Wossrld");

        GenerateFibonacci(1);

    }

        public static IEnumerable<int> GenerateFibonacci(int max) {

            int a = 0;

            int b =1;

            yield return a;

            yield return b;

            while(b < max) {

                int c = a+b;

                yield return c;

                a = b;

                b = c;

            }

            Console.WriteLine("Hello Wossrld", max);

        }

​

}