import java.util.Scanner


import scala.io.StdIn._

object Main extends App {

  val Array(n,m) = readLine().split(" ").map(_.toInt)
  val A = readLine().split(" ").map(_.toInt)

  def solve() = {
    val sorted = A.sorted(Ordering[Int].reverse)
    val border = A.sum.toDouble / (4 * m)
    if(sorted(m-1) >= border) "Yes" else "No"
  }

  println(solve())

}

