package twelvedays

import scala.annotation.tailrec
class TwelveDays {

  @tailrec
  final def calculateGiftsGivenOnDay(day: Int, totalGifts: Int = 0): Int = {
    if (day == 1) {
      totalGifts + day
    } else {
      calculateGiftsGivenOnDay(day - 1, totalGifts + day)
    }
  }

}