gistfile1.scala

object Alg {
  
  sealed trait Num { def toInt: Int }
  sealed trait Big extends Num
  sealed trait Small extends Num
  
  object Big {
    
    def fromInt(n:Int): Option[Big] =
      if (n >= 5) Some(new Big { def toInt = n }) else None
      
    def unapply(n: Big): Some[Int] =
      Some(n.toInt)
      
  }

  object Small {
    
    def fromInt(n:Int): Option[Small] =
      if (n < 5) Some(new Small { def toInt = n }) else None
      
    def unapply(n: Small): Some[Int] =
      Some(n.toInt)
      
  }

}