Solution To Project Euler Problem #1[ Scala Version]

package projecteuler

object MultiplesOf3And5 {
  def main(args: Array[String]) {
    def res = multiply(999, 3) + multiply(999, 5) - multiply(999, 15)
    println(res)
  }
  def multiply(num: Int, x: Int): Int = {
    if (num % x != 0)
      multiply(num - 1, x)
    else if (num < x) 0
    else num + multiply(num - x, x);
  }
}