using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication1{    class Program    {        static void Main(string[] args)        {            int n = Convert.ToInt32(Console.ReadLine());            if (n <= 0)            {                Console.WriteLine("必须大于0");                return;            }            if (n == 1)  //时刻注意边界值！！！            {                Console.WriteLine("1");                return;            }            int[] data = new int[n];            data[0] = 1;            data[1] = 1;            for (int i = 2; i < n; i++)            {                data[i] = data[i - 1] + data[i - 2];            }            Console.WriteLine(data[n - 1]);            Console.ReadLine();        }    }}