def countChange(money: Int, coins: List[Int]): Int = {
    if (coins.isEmpty) 0
    else if (money == 0) 1
    else if (money >= coins.head && !coins.isEmpty) countChange(money - coins.head, coins) + countChange(money - coins.head, coins.tail)
    else if (money < coins.head && !coins.isEmpty) countChange(money, coins.tail)
    else 0
  }