import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = Integer.parseInt(scanner.next());
        int m = Integer.parseInt(scanner.next());
        int[] a = new int[n];
        int sum = 0;
        int ai;
        for (int i = 0; i < n; i++) {
            ai = Integer.parseInt(scanner.next());
            sum += ai;
            a[i] = ai;
        }
        Arrays.sort(a);
        if ((4*m)*a[n-m] < sum) {
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = Integer.parseInt(scanner.next());
        int m = Integer.parseInt(scanner.next());
        int[] a = new int[n];
        int sum = 0;
        int ai;
        for (int i = 0; i < n; i++) {
            ai = Integer.parseInt(scanner.next());
            sum += ai;
            a[i] = ai;
        }
        Arrays.sort(a);
        if ((4*m)*a[n-m] < sum) {
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }
    }
} Main public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = Integer.parseInt(scanner.next());
        int m = Integer.parseInt(scanner.next());
        int[] a = new int[n];
        int sum = 0;
        int ai;
        for (int i = 0; i < n; i++) {
            ai = Integer.parseInt(scanner.next());
            sum += ai;
            a[i] = ai;
        }
        Arrays.sort(a);
        if ((4*m)*a[n-m] < sum) {
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }
    } main {
        Scanner scanner = new Scanner(System.in);
        int n = Integer.parseInt(scanner.next());
        int m = Integer.parseInt(scanner.next());
        int[] a = new int[n];
        int sum = 0;
        int ai;
        for (int i = 0; i < n; i++) {
            ai = Integer.parseInt(scanner.next());
            sum += ai;
            a[i] = ai;
        }
        Arrays.sort(a);
        if ((4*m)*a[n-m] < sum) {
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }
    } Scanner scanner = new Scanner(System.in); scanner new Scanner(System.in) int n = Integer.parseInt(scanner.next()); n Integer.parseInt(scanner.next()) Integer.parseInt Integer scanner.next() scanner.next scanner int m = Integer.parseInt(scanner.next()); m Integer.parseInt(scanner.next()) Integer.parseInt Integer scanner.next() scanner.next scanner int[] a = new int[n]; a new int[n] n int sum = 0; sum 0 int ai; ai for (int i = 0; i < n; i++) {
            ai = Integer.parseInt(scanner.next());
            sum += ai;
            a[i] = ai;
        } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
            ai = Integer.parseInt(scanner.next());
            sum += ai;
            a[i] = ai;
        } {
            ai = Integer.parseInt(scanner.next());
            sum += ai;
            a[i] = ai;
        } ai = Integer.parseInt(scanner.next()) ai Integer.parseInt(scanner.next()) Integer.parseInt Integer scanner.next() scanner.next scanner sum += ai sum ai a[i] = ai a[i] a i ai Arrays.sort(a) Arrays.sort Arrays a if ((4*m)*a[n-m] < sum) {
            System.out.println("No");
        } else {
            System.out.println("Yes");
        } (4*m)*a[n-m] < sum (4*m)*a[n-m] (4*m) 4 m a[n-m] a n-m n m sum {
            System.out.println("No");
        } System.out.println("No") System.out.println System.out System System.out "No" {
            System.out.println("Yes");
        } System.out.println("Yes") System.out.println System.out System System.out "Yes" String[] args args public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = Integer.parseInt(scanner.next());
        int m = Integer.parseInt(scanner.next());
        int[] a = new int[n];
        int sum = 0;
        int ai;
        for (int i = 0; i < n; i++) {
            ai = Integer.parseInt(scanner.next());
            sum += ai;
            a[i] = ai;
        }
        Arrays.sort(a);
        if ((4*m)*a[n-m] < sum) {
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }
    }
} public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = Integer.parseInt(scanner.next());
        int m = Integer.parseInt(scanner.next());
        int[] a = new int[n];
        int sum = 0;
        int ai;
        for (int i = 0; i < n; i++) {
            ai = Integer.parseInt(scanner.next());
            sum += ai;
            a[i] = ai;
        }
        Arrays.sort(a);
        if ((4*m)*a[n-m] < sum) {
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }
    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = Integer.parseInt(scanner.next());
        int m = Integer.parseInt(scanner.next());
        int[] a = new int[n];
        int sum = 0;
        int ai;
        for (int i = 0; i < n; i++) {
            ai = Integer.parseInt(scanner.next());
            sum += ai;
            a[i] = ai;
        }
        Arrays.sort(a);
        if ((4*m)*a[n-m] < sum) {
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }
    }
}