def countChange(money: Int, coins: List[Int]): Int = {
    var ret = 0

    def iterator(money: Int, coins: List[Int]) {
      if (!coins.isEmpty) {
        val rest = money - coins.head

        if (rest > 0) iterator(rest, coins)
        else if (rest == 0) ret = ret + 1

        iterator(money, coins.tail)
      }
    }

    iterator(money, coins)
    ret
  }