fun main(args: Array<String>) {
    val l1 = readLine()!!.split(" ").map { it.toInt() }
    val l2 = readLine()!!.split(" ").map { it.toInt() }
    var s = 0
    l2.forEach  { s += it }
    var c = 0
    l2.forEach { if (4*l1[1]*it >= s) c++ }
    println(if (c >= l1[1]) "Yes" else "No")
}