import kotlin.math.*
import java.util.*

fun main(args: Array<String>) {
  val (_, m) = readLine()!!.split(' ').map(String::toInt)
  val a = readLine()!!.split(' ').map(String::toDouble)
  val b = a.sum() / (4 * m)
  println(if (m <= a.count { b <= it }) "Yes" else "No")
}
