import java.util.Scanner

fun main(args: Array<String>) {
	val scn = Scanner(System.`in`)
	val n = scn.nextInt()
	val m = scn.nextInt()
	val arr = IntArray(n){scn.nextInt()}
	val sum = arr.sum()
	arr.sortDescending()
	println(if (arr[m-1]*4*m >= sum) "Yes" else "No")
}