using System;

using System.Collections;

using System.Collections.Generic;

​

namespace Fibbonachi

{

    public class Program

    {

        public static void Main()

        {

            Fibbonachi mass = new Fibbonachi();

            foreach (int _i in mass)

                    Console.Write(_i + "\n");

        }

        public class Fibbonachi : IEnumerable<int>

        {

            int _first = 1;

            int _second = 1;

            int _bufer; 

            public IEnumerator<int> GetEnumerator()

            {

                return GetFibbonachi().GetEnumerator();

            }

            IEnumerator IEnumerable.GetEnumerator()

            {

                return GetEnumerator();

            }

            protected IEnumerable<int> GetFibbonachi()

            {

                for(int _i=0; ; _i++)

                {

                    if(_i == 30)

                        yield break; 

                    yield return (_first + _second);

                    _bufer = _second;

                    _second += _first;

                    _first = _bufer;

                }

​

            }

        }

    }

}