using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
   
         public static  int i = 0;
        static void Main(string[] args)
        {

            //走楼梯程序   有几种方法        不知道他的思路    求大神：概述一下思路
           stair(4);
         
        }

        private static int  stair(int numder)
        {
          
           
          int result=0;
            if (numder == 1)
            {
                result = 1;
            }
            else if (numder == 2)
            {
                result = 2;
            }
            else
            {
                result = stair(numder - 1) + stair(numder - 2);
            }
            return  result;

        }
    }
   
}