import java.util.Arrays;
import java.util.Collections;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner (System.in);
		int n = sc.nextInt();
		int m = sc.nextInt();
		
		Integer[] arr = new Integer[n];
		int sum = 0;
		for (int i=0; i<n; i++) {
			arr[i] = sc.nextInt();
			sum += arr[i];
		}
		
		Arrays.sort(arr, Collections.reverseOrder());
		double limit = (double) sum/(4*m);

		if (arr[m-1] >= limit) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}
	}
} import java.util.Arrays; Arrays java.util import java.util.Collections; Collections java.util import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner (System.in);
		int n = sc.nextInt();
		int m = sc.nextInt();
		
		Integer[] arr = new Integer[n];
		int sum = 0;
		for (int i=0; i<n; i++) {
			arr[i] = sc.nextInt();
			sum += arr[i];
		}
		
		Arrays.sort(arr, Collections.reverseOrder());
		double limit = (double) sum/(4*m);

		if (arr[m-1] >= limit) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner (System.in);
		int n = sc.nextInt();
		int m = sc.nextInt();
		
		Integer[] arr = new Integer[n];
		int sum = 0;
		for (int i=0; i<n; i++) {
			arr[i] = sc.nextInt();
			sum += arr[i];
		}
		
		Arrays.sort(arr, Collections.reverseOrder());
		double limit = (double) sum/(4*m);

		if (arr[m-1] >= limit) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}
	} main {
		Scanner sc = new Scanner (System.in);
		int n = sc.nextInt();
		int m = sc.nextInt();
		
		Integer[] arr = new Integer[n];
		int sum = 0;
		for (int i=0; i<n; i++) {
			arr[i] = sc.nextInt();
			sum += arr[i];
		}
		
		Arrays.sort(arr, Collections.reverseOrder());
		double limit = (double) sum/(4*m);

		if (arr[m-1] >= limit) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}
	} Scanner sc = new Scanner (System.in); sc new Scanner (System.in) int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc int m = sc.nextInt(); m sc.nextInt() sc.nextInt sc Integer[] arr = new Integer[n]; arr new Integer[n] n int sum = 0; sum 0 for (int i=0; i<n; i++) {
			arr[i] = sc.nextInt();
			sum += arr[i];
		} int i=0; int i=0; i 0 i<n i n i++ i++ i {
			arr[i] = sc.nextInt();
			sum += arr[i];
		} {
			arr[i] = sc.nextInt();
			sum += arr[i];
		} arr[i] = sc.nextInt() arr[i] arr i sc.nextInt() sc.nextInt sc sum += arr[i] sum arr[i] arr i Arrays.sort(arr, Collections.reverseOrder()) Arrays.sort Arrays arr Collections.reverseOrder() Collections.reverseOrder Collections double limit = (double) sum/(4*m); limit (double) sum/(4*m) (double) sum (4*m) 4 m if (arr[m-1] >= limit) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		} arr[m-1] >= limit arr[m-1] arr m-1 m 1 limit {
			System.out.println("Yes");
		} System.out.println("Yes") System.out.println System.out System System.out "Yes" {
			System.out.println("No");
		} System.out.println("No") System.out.println System.out System System.out "No" String[] args args public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner (System.in);
		int n = sc.nextInt();
		int m = sc.nextInt();
		
		Integer[] arr = new Integer[n];
		int sum = 0;
		for (int i=0; i<n; i++) {
			arr[i] = sc.nextInt();
			sum += arr[i];
		}
		
		Arrays.sort(arr, Collections.reverseOrder());
		double limit = (double) sum/(4*m);

		if (arr[m-1] >= limit) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}
	}
} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner (System.in);
		int n = sc.nextInt();
		int m = sc.nextInt();
		
		Integer[] arr = new Integer[n];
		int sum = 0;
		for (int i=0; i<n; i++) {
			arr[i] = sc.nextInt();
			sum += arr[i];
		}
		
		Arrays.sort(arr, Collections.reverseOrder());
		double limit = (double) sum/(4*m);

		if (arr[m-1] >= limit) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}
	}
} Main
import java.util.Arrays;
import java.util.Collections;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner (System.in);
		int n = sc.nextInt();
		int m = sc.nextInt();
		
		Integer[] arr = new Integer[n];
		int sum = 0;
		for (int i=0; i<n; i++) {
			arr[i] = sc.nextInt();
			sum += arr[i];
		}
		
		Arrays.sort(arr, Collections.reverseOrder());
		double limit = (double) sum/(4*m);

		if (arr[m-1] >= limit) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}
	}
}
