import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;
public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		int n = scan.nextInt();
		int m = scan.nextInt();
		Integer[] a = new Integer[n];

		int sum = 0;


		for(int i = 0;i < n;i++) {
			a[i] = scan.nextInt();

			 sum += a[i];
		}

		Arrays.sort(a,Comparator.reverseOrder());

	double min = (double)sum/(4*m);

		System.out.println(a[m-1] >= min ? "Yes":"No");

		scan.close();

	}

} import java.util.Arrays; Arrays java.util import java.util.Comparator; Comparator java.util import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		int n = scan.nextInt();
		int m = scan.nextInt();
		Integer[] a = new Integer[n];

		int sum = 0;


		for(int i = 0;i < n;i++) {
			a[i] = scan.nextInt();

			 sum += a[i];
		}

		Arrays.sort(a,Comparator.reverseOrder());

	double min = (double)sum/(4*m);

		System.out.println(a[m-1] >= min ? "Yes":"No");

		scan.close();

	}

} Main public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		int n = scan.nextInt();
		int m = scan.nextInt();
		Integer[] a = new Integer[n];

		int sum = 0;


		for(int i = 0;i < n;i++) {
			a[i] = scan.nextInt();

			 sum += a[i];
		}

		Arrays.sort(a,Comparator.reverseOrder());

	double min = (double)sum/(4*m);

		System.out.println(a[m-1] >= min ? "Yes":"No");

		scan.close();

	} main {

		Scanner scan = new Scanner(System.in);

		int n = scan.nextInt();
		int m = scan.nextInt();
		Integer[] a = new Integer[n];

		int sum = 0;


		for(int i = 0;i < n;i++) {
			a[i] = scan.nextInt();

			 sum += a[i];
		}

		Arrays.sort(a,Comparator.reverseOrder());

	double min = (double)sum/(4*m);

		System.out.println(a[m-1] >= min ? "Yes":"No");

		scan.close();

	} Scanner scan = new Scanner(System.in); scan new Scanner(System.in) int n = scan.nextInt(); n scan.nextInt() scan.nextInt scan int m = scan.nextInt(); m scan.nextInt() scan.nextInt scan Integer[] a = new Integer[n]; a new Integer[n] n int sum = 0; sum 0 for(int i = 0;i < n;i++) {
			a[i] = scan.nextInt();

			 sum += a[i];
		} int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
			a[i] = scan.nextInt();

			 sum += a[i];
		} {
			a[i] = scan.nextInt();

			 sum += a[i];
		} a[i] = scan.nextInt() a[i] a i scan.nextInt() scan.nextInt scan sum += a[i] sum a[i] a i Arrays.sort(a,Comparator.reverseOrder()) Arrays.sort Arrays a Comparator.reverseOrder() Comparator.reverseOrder Comparator double min = (double)sum/(4*m); min (double)sum/(4*m) (double)sum (4*m) 4 m System.out.println(a[m-1] >= min ? "Yes":"No") System.out.println System.out System System.out a[m-1] >= min ? "Yes":"No" a[m-1] >= min a[m-1] a m-1 m 1 min "Yes" "No" scan.close() scan.close scan String[] args args public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		int n = scan.nextInt();
		int m = scan.nextInt();
		Integer[] a = new Integer[n];

		int sum = 0;


		for(int i = 0;i < n;i++) {
			a[i] = scan.nextInt();

			 sum += a[i];
		}

		Arrays.sort(a,Comparator.reverseOrder());

	double min = (double)sum/(4*m);

		System.out.println(a[m-1] >= min ? "Yes":"No");

		scan.close();

	}

} public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		int n = scan.nextInt();
		int m = scan.nextInt();
		Integer[] a = new Integer[n];

		int sum = 0;


		for(int i = 0;i < n;i++) {
			a[i] = scan.nextInt();

			 sum += a[i];
		}

		Arrays.sort(a,Comparator.reverseOrder());

	double min = (double)sum/(4*m);

		System.out.println(a[m-1] >= min ? "Yes":"No");

		scan.close();

	}

} Main
import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;
public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		int n = scan.nextInt();
		int m = scan.nextInt();
		Integer[] a = new Integer[n];

		int sum = 0;


		for(int i = 0;i < n;i++) {
			a[i] = scan.nextInt();

			 sum += a[i];
		}

		Arrays.sort(a,Comparator.reverseOrder());

	double min = (double)sum/(4*m);

		System.out.println(a[m-1] >= min ? "Yes":"No");

		scan.close();

	}

}
