import scala.io.StdIn

object Main extends App {
  val Array(_,m) = StdIn.readLine().split(" ").map(_.toInt)
  val a = StdIn.readLine().split(" ").map(_.toInt)
  val c = a.count(_ >= (1/(4.0*m)) * a.sum)
  println(if (c >= m) "Yes" else "No")
}