object Main extends App {
	val Array(n, m) = scala.io.StdIn.readLine.split(" ").map(_.toInt)
	val a = scala.io.StdIn.readLine.split(" ").map(_.toInt)
 
	val Asum = a.sum/(4*m)
 
	if(a.count(_ >= Asum) >= m) println("Yes")
	else println("No")
}