class Program
 {
  static void Main(string[] args)
  {
   Program p = new Program();
   Console.WriteLine(p.tuzi(7));
  }
  public int tuzi(int n) 
  {
   if (n == 1 || n == 2)
   {
    return 1;
   }
   else 
   {
    return tuzi(n - 1) + tuzi(n - 2);
   }
  }
 }

class Program
 {
  static void Main(string[] args)
  {
   Program p = new Program();
   
   Console.WriteLine( p.age(5));
  }
  /// <summary>
  /// 递归法求岁数
  /// </summary>
  /// <param name="n">有几个人</param>
  /// <returns></returns>
  int age(int n)
  {
   int c;
   if(n==1)
    return 10;
  
   else
   {
    c = age(n-1)+2;
    return c;
   } 
  }

class Program
 {
  static void Main(string[] args)
  {
   
   Program p = new Program();
   
   Console.WriteLine( p.PeachNumber(5));
   
  }
  /// <summary>
  /// 递归法求桃子数
  /// </summary>
  /// <param name="n"></param>
  /// <returns></returns>
  int PeachNumber(int n) 
  {
   if (n == 1)
   {
    //最后一个是至少是六个
    return 6;
   }
   else 
   {
    return (PeachNumber(n - 1) + 1) * 5;
   }
  }