import 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();
        int[] a = new int[n];
        int sum = 0;
        for(int i = 0; i < n; i++){
            a[i] = sc.nextInt();
            sum += a[i];
        }
        double border = sum * (1d / (4 * m));
        int count = 0;
        for(int i = 0; i < n; i++){
            if(a[i] >= border){
                count++;
            }
        }
        if(count >= m){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
    }
} import java.util.*; util.* java public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int m = sc.nextInt();
        int[] a = new int[n];
        int sum = 0;
        for(int i = 0; i < n; i++){
            a[i] = sc.nextInt();
            sum += a[i];
        }
        double border = sum * (1d / (4 * m));
        int count = 0;
        for(int i = 0; i < n; i++){
            if(a[i] >= border){
                count++;
            }
        }
        if(count >= m){
            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();
        int[] a = new int[n];
        int sum = 0;
        for(int i = 0; i < n; i++){
            a[i] = sc.nextInt();
            sum += a[i];
        }
        double border = sum * (1d / (4 * m));
        int count = 0;
        for(int i = 0; i < n; i++){
            if(a[i] >= border){
                count++;
            }
        }
        if(count >= m){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
    } main {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int m = sc.nextInt();
        int[] a = new int[n];
        int sum = 0;
        for(int i = 0; i < n; i++){
            a[i] = sc.nextInt();
            sum += a[i];
        }
        double border = sum * (1d / (4 * m));
        int count = 0;
        for(int i = 0; i < n; i++){
            if(a[i] >= border){
                count++;
            }
        }
        if(count >= m){
            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 int[] a = new int[n]; a new int[n] n int sum = 0; sum 0 for(int i = 0; i < n; i++){
            a[i] = sc.nextInt();
            sum += a[i];
        } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
            a[i] = sc.nextInt();
            sum += a[i];
        } {
            a[i] = sc.nextInt();
            sum += a[i];
        } a[i] = sc.nextInt() a[i] a i sc.nextInt() sc.nextInt sc sum += a[i] sum a[i] a i double border = sum * (1d / (4 * m)); border sum * (1d / (4 * m)) sum (1d / (4 * m)) 1d (4 * m) 4 m int count = 0; count 0 for(int i = 0; i < n; i++){
            if(a[i] >= border){
                count++;
            }
        } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
            if(a[i] >= border){
                count++;
            }
        } {
            if(a[i] >= border){
                count++;
            }
        } if(a[i] >= border){
                count++;
            } a[i] >= border a[i] a i border {
                count++;
            } count++ count if(count >= m){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        } count >= m count m {
            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();
        int[] a = new int[n];
        int sum = 0;
        for(int i = 0; i < n; i++){
            a[i] = sc.nextInt();
            sum += a[i];
        }
        double border = sum * (1d / (4 * m));
        int count = 0;
        for(int i = 0; i < n; i++){
            if(a[i] >= border){
                count++;
            }
        }
        if(count >= m){
            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();
        int[] a = new int[n];
        int sum = 0;
        for(int i = 0; i < n; i++){
            a[i] = sc.nextInt();
            sum += a[i];
        }
        double border = sum * (1d / (4 * m));
        int count = 0;
        for(int i = 0; i < n; i++){
            if(a[i] >= border){
                count++;
            }
        }
        if(count >= m){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
    }
} Main
import 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();
        int[] a = new int[n];
        int sum = 0;
        for(int i = 0; i < n; i++){
            a[i] = sc.nextInt();
            sum += a[i];
        }
        double border = sum * (1d / (4 * m));
        int count = 0;
        for(int i = 0; i < n; i++){
            if(a[i] >= border){
                count++;
            }
        }
        if(count >= m){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
    }
}
