trait Longable{ def toLong(): Long }

implicit class IntCanLong(int: Int) extends Longable {
  def toLong(): Long = int.toLong
}

implicit class StringCanLong(str: String) extends Longable {
  def toLong(): Long = str.toInt.toLong
}

val l: List[Longable] = List(1,"5")

val myMap = Map[String, Longable](
  "one" -> 1,
  "two" -> "2"
)

myMap.valuesIterator.foreach(l => println(l.toLong))