import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        final Scanner sc = new Scanner(System.in);

        final int n = sc.nextInt();
        final int m = sc.nextInt();

        final Integer[] a = new Integer[n];
        int points = 0;
        for (int i = 0; i < n; i++) {
            a[i] = sc.nextInt();
            points += a[i];
        }

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

        if (a[m-1] * 4 * m >= points) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }
} 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) {
        final Scanner sc = new Scanner(System.in);

        final int n = sc.nextInt();
        final int m = sc.nextInt();

        final Integer[] a = new Integer[n];
        int points = 0;
        for (int i = 0; i < n; i++) {
            a[i] = sc.nextInt();
            points += a[i];
        }

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

        if (a[m-1] * 4 * m >= points) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }
} Main public static void main(String[] args) {
        final Scanner sc = new Scanner(System.in);

        final int n = sc.nextInt();
        final int m = sc.nextInt();

        final Integer[] a = new Integer[n];
        int points = 0;
        for (int i = 0; i < n; i++) {
            a[i] = sc.nextInt();
            points += a[i];
        }

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

        if (a[m-1] * 4 * m >= points) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    } main {
        final Scanner sc = new Scanner(System.in);

        final int n = sc.nextInt();
        final int m = sc.nextInt();

        final Integer[] a = new Integer[n];
        int points = 0;
        for (int i = 0; i < n; i++) {
            a[i] = sc.nextInt();
            points += a[i];
        }

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

        if (a[m-1] * 4 * m >= points) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    } final Scanner sc = new Scanner(System.in); sc new Scanner(System.in) final int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc final int m = sc.nextInt(); m sc.nextInt() sc.nextInt sc final Integer[] a = new Integer[n]; a new Integer[n] n int points = 0; points 0 for (int i = 0; i < n; i++) {
            a[i] = sc.nextInt();
            points += a[i];
        } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
            a[i] = sc.nextInt();
            points += a[i];
        } {
            a[i] = sc.nextInt();
            points += a[i];
        } a[i] = sc.nextInt() a[i] a i sc.nextInt() sc.nextInt sc points += a[i] points a[i] a i Arrays.sort(a, Comparator.reverseOrder()) Arrays.sort Arrays a Comparator.reverseOrder() Comparator.reverseOrder Comparator if (a[m-1] * 4 * m >= points) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        } a[m-1] * 4 * m >= points a[m-1] * 4 * m a[m-1] * 4 * m a[m-1] a m-1 m 1 4 m points {
            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) {
        final Scanner sc = new Scanner(System.in);

        final int n = sc.nextInt();
        final int m = sc.nextInt();

        final Integer[] a = new Integer[n];
        int points = 0;
        for (int i = 0; i < n; i++) {
            a[i] = sc.nextInt();
            points += a[i];
        }

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

        if (a[m-1] * 4 * m >= points) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }
} public class Main {

    public static void main(String[] args) {
        final Scanner sc = new Scanner(System.in);

        final int n = sc.nextInt();
        final int m = sc.nextInt();

        final Integer[] a = new Integer[n];
        int points = 0;
        for (int i = 0; i < n; i++) {
            a[i] = sc.nextInt();
            points += a[i];
        }

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

        if (a[m-1] * 4 * m >= points) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }
} Main
import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        final Scanner sc = new Scanner(System.in);

        final int n = sc.nextInt();
        final int m = sc.nextInt();

        final Integer[] a = new Integer[n];
        int points = 0;
        for (int i = 0; i < n; i++) {
            a[i] = sc.nextInt();
            points += a[i];
        }

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

        if (a[m-1] * 4 * m >= points) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }
}
