import java.util.*

fun main(args : Array<String>) {
    val sc = Scanner(System.`in`)

    var N = sc.nextInt()
    val M = sc.nextFloat()
    var total = 0F
    var A = mutableListOf<Float>()
    for(i in 0 until N) {
        val a = sc.nextFloat()
        A.add(a)
        total += a
    }

    var cnt = 0
    val min = total / (4F * M)
    for (i in 0 until N) {
        if (A[i] >= min) {
            cnt++
        }
    }
    if (cnt >= M) {
        println("Yes")
    } else {
        println("No")
    }
}
