import java.util.Scanner;
import java.lang.Math;
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];
        double aa = 0;
        for(int i = 0; i<n ; i++){
            a[i]=sc.nextInt();
            aa = aa + a [i];
        }
        sc.close();

        a = sort(a);
        if(a[m-1] >= aa/(4.0*m)){
            System.out.println("Yes");          
        }else{
            System.out.println("No");
        }
    }
    public static int[] sort(int[] a){
        int x;
        for(int i=0;i<a.length;i++){
            x = a[i];
            for(int j=0;j<a.length;j++){
                if(x == Math.max(x,a[j])){
                    a[i]=a[j];
                    a[j]=x;
                    x=a[i];
                }
            }
        }
        return a;
    }
} import java.util.Scanner; Scanner java.util import java.lang.Math; Math java.lang 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];
        double aa = 0;
        for(int i = 0; i<n ; i++){
            a[i]=sc.nextInt();
            aa = aa + a [i];
        }
        sc.close();

        a = sort(a);
        if(a[m-1] >= aa/(4.0*m)){
            System.out.println("Yes");          
        }else{
            System.out.println("No");
        }
    }
    public static int[] sort(int[] a){
        int x;
        for(int i=0;i<a.length;i++){
            x = a[i];
            for(int j=0;j<a.length;j++){
                if(x == Math.max(x,a[j])){
                    a[i]=a[j];
                    a[j]=x;
                    x=a[i];
                }
            }
        }
        return a;
    }
} 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];
        double aa = 0;
        for(int i = 0; i<n ; i++){
            a[i]=sc.nextInt();
            aa = aa + a [i];
        }
        sc.close();

        a = sort(a);
        if(a[m-1] >= aa/(4.0*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];
        double aa = 0;
        for(int i = 0; i<n ; i++){
            a[i]=sc.nextInt();
            aa = aa + a [i];
        }
        sc.close();

        a = sort(a);
        if(a[m-1] >= aa/(4.0*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 double aa = 0; aa 0 for(int i = 0; i<n ; i++){
            a[i]=sc.nextInt();
            aa = aa + a [i];
        } int i = 0; int i = 0; i 0 i<n i n i++ i++ i {
            a[i]=sc.nextInt();
            aa = aa + a [i];
        } {
            a[i]=sc.nextInt();
            aa = aa + a [i];
        } a[i]=sc.nextInt() a[i] a i sc.nextInt() sc.nextInt sc aa = aa + a [i] aa aa + a [i] aa a [i] a i sc.close() sc.close sc a = sort(a) a sort(a) sort a if(a[m-1] >= aa/(4.0*m)){
            System.out.println("Yes");          
        }else{
            System.out.println("No");
        } a[m-1] >= aa/(4.0*m) a[m-1] a m-1 m 1 aa/(4.0*m) aa (4.0*m) 4.0 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 static int[] sort(int[] a){
        int x;
        for(int i=0;i<a.length;i++){
            x = a[i];
            for(int j=0;j<a.length;j++){
                if(x == Math.max(x,a[j])){
                    a[i]=a[j];
                    a[j]=x;
                    x=a[i];
                }
            }
        }
        return a;
    } sort {
        int x;
        for(int i=0;i<a.length;i++){
            x = a[i];
            for(int j=0;j<a.length;j++){
                if(x == Math.max(x,a[j])){
                    a[i]=a[j];
                    a[j]=x;
                    x=a[i];
                }
            }
        }
        return a;
    } int x; x for(int i=0;i<a.length;i++){
            x = a[i];
            for(int j=0;j<a.length;j++){
                if(x == Math.max(x,a[j])){
                    a[i]=a[j];
                    a[j]=x;
                    x=a[i];
                }
            }
        } int i=0; int i=0; i 0 i<a.length i a.length a a.length i++ i++ i {
            x = a[i];
            for(int j=0;j<a.length;j++){
                if(x == Math.max(x,a[j])){
                    a[i]=a[j];
                    a[j]=x;
                    x=a[i];
                }
            }
        } {
            x = a[i];
            for(int j=0;j<a.length;j++){
                if(x == Math.max(x,a[j])){
                    a[i]=a[j];
                    a[j]=x;
                    x=a[i];
                }
            }
        } x = a[i] x a[i] a i for(int j=0;j<a.length;j++){
                if(x == Math.max(x,a[j])){
                    a[i]=a[j];
                    a[j]=x;
                    x=a[i];
                }
            } int j=0; int j=0; j 0 j<a.length j a.length a a.length j++ j++ j {
                if(x == Math.max(x,a[j])){
                    a[i]=a[j];
                    a[j]=x;
                    x=a[i];
                }
            } {
                if(x == Math.max(x,a[j])){
                    a[i]=a[j];
                    a[j]=x;
                    x=a[i];
                }
            } if(x == Math.max(x,a[j])){
                    a[i]=a[j];
                    a[j]=x;
                    x=a[i];
                } x == Math.max(x,a[j]) x Math.max(x,a[j]) Math.max Math x a[j] a j {
                    a[i]=a[j];
                    a[j]=x;
                    x=a[i];
                } a[i]=a[j] a[i] a i a[j] a j a[j]=x a[j] a j x x=a[i] x a[i] a i return a; a int[] a a
import java.util.Scanner;
import java.lang.Math;
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];
        double aa = 0;
        for(int i = 0; i<n ; i++){
            a[i]=sc.nextInt();
            aa = aa + a [i];
        }
        sc.close();

        a = sort(a);
        if(a[m-1] >= aa/(4.0*m)){
            System.out.println("Yes");          
        }else{
            System.out.println("No");
        }
    }
    public static int[] sort(int[] a){
        int x;
        for(int i=0;i<a.length;i++){
            x = a[i];
            for(int j=0;j<a.length;j++){
                if(x == Math.max(x,a[j])){
                    a[i]=a[j];
                    a[j]=x;
                    x=a[i];
                }
            }
        }
        return a;
    }
}