Problem 1 in Scala

/**
  * Multiples of 3 and 5: https://projecteuler.net/problem=1
  *
  * If we list all the natural numbers below 10 that are multiples of 3 or 5,
  * we get 3, 5, 6 and 9. The sum of these multiples is 23.
  *
  * Find the sum of all the multiples of 3 or 5 below 1000.
  */

val n = 1000
val answer = 1.until(n).filter(x => (x % 3 == 0 || x % 5 == 0)).sum