枚举法 之Java实现凑硬币

问题？
如何利用1元五元十元凑硬币

Scanner in=new Scanner(System.in);
  int amout ;
  amout=in.nextInt();
  for(int one =0;one<=amout;one++)
  {
   for(int five =0;five<=amout/5;five++)
   {
    for(int ten =0;ten<=amout/10;ten++)
    {
     for(int twity =0;twity<=amout/20;twity++)
     {
      if(one+five*5+ten*10+twity*20==amout)
      {
       System.out.println(one+"张1元"+five+"张5元"+ten+"张10元"+twity+"张20元");
      }
     }
    }
   }
  }