#include<stdio.h>
int main()
{
 unsigned long count(int n);
 int n;
 unsigned long m;
 printf("請輸入樓梯的階數(shù):");
 scanf("%d",&n);
 m=count(n);
 printf("有%lu種爬樓梯的方法\n",m);
 return 0;
}
unsigned long count (int n)
{
 unsigned long f;
 if(n==1)
  f=1;
 else if(n==2)
  f=2;
 else
  f=count(n-1)+count(n-2);
 return(f);
}

//計163-1姜淇瀚
#include <stdio.h>
#include <stdlib.h>
int main()
{
 int fib(int a,int b,int n);
 int n;
 scanf("%d",&n);
 printf("%d",fib(0,1,n));
 return 0;
}
int fib(int a,int b,int n)
{
 if(n==3)
 {
  return a+b;
 }
  return fib(b,a+b,n-1);
}