package com.thinker.bishi.saima; import java.util.Scanner; /** * @author lzh *

* http://exercise.acmcoder.com/online/online_judge_ques?ques_id=1668&konwledgeId=134 *

*/ public class Stairs { private static int count = 0; public static void main(String[] args) { Scanner in = new Scanner(System.in); int n = in.nextInt(); if(n <= 0) return; for(int i=0;i