native scala.collection.mutable.Queue

val hamming =
  q2 = Queue()
  q3 = Queue()
  q5 = Queue()

  def enqueue( n ) =
    q2.enqueue( n*2 )
    q3.enqueue( n*3 )
    q5.enqueue( n*5 )

  def stream =
    val n = min( min(q2.head(), q3.head()), q5.head() )

    if q2.head() == n then q2.dequeue()
    if q3.head() == n then q3.dequeue()
    if q5.head() == n then q5.dequeue()

    enqueue( n )
    n # stream()

  for q <- [q2, q3, q5] do q.enqueue( 1 )

  stream()