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();
        Integer A[]= new Integer[N];
        int sum = 0;
        for(int i=0;i<N;i++){
            A[i] = sc.nextInt();
            sum += A[i];
        }
        Arrays.sort(A,Collections.reverseOrder());
        int b = A[M-1]*4*M;
        if(b<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 sc = new Scanner(System.in);
        int N = sc.nextInt();
        int M = sc.nextInt();
        Integer A[]= new Integer[N];
        int sum = 0;
        for(int i=0;i<N;i++){
            A[i] = sc.nextInt();
            sum += A[i];
        }
        Arrays.sort(A,Collections.reverseOrder());
        int b = A[M-1]*4*M;
        if(b<sum){
            System.out.println("No");
        }else{
            System.out.println("Yes");
        }

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

        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int M = sc.nextInt();
        Integer A[]= new Integer[N];
        int sum = 0;
        for(int i=0;i<N;i++){
            A[i] = sc.nextInt();
            sum += A[i];
        }
        Arrays.sort(A,Collections.reverseOrder());
        int b = A[M-1]*4*M;
        if(b<sum){
            System.out.println("No");
        }else{
            System.out.println("Yes");
        }

    } main {

        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int M = sc.nextInt();
        Integer A[]= new Integer[N];
        int sum = 0;
        for(int i=0;i<N;i++){
            A[i] = sc.nextInt();
            sum += A[i];
        }
        Arrays.sort(A,Collections.reverseOrder());
        int b = A[M-1]*4*M;
        if(b<sum){
            System.out.println("No");
        }else{
            System.out.println("Yes");
        }

    } 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 Integer A[]= new Integer[N]; A new Integer[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 Arrays.sort(A,Collections.reverseOrder()) Arrays.sort Arrays A Collections.reverseOrder() Collections.reverseOrder Collections int b = A[M-1]*4*M; b A[M-1]*4*M A[M-1]*4*M A[M-1] A M-1 M 1 4 M if(b<sum){
            System.out.println("No");
        }else{
            System.out.println("Yes");
        } b<sum b 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 sc = new Scanner(System.in);
        int N = sc.nextInt();
        int M = sc.nextInt();
        Integer A[]= new Integer[N];
        int sum = 0;
        for(int i=0;i<N;i++){
            A[i] = sc.nextInt();
            sum += A[i];
        }
        Arrays.sort(A,Collections.reverseOrder());
        int b = A[M-1]*4*M;
        if(b<sum){
            System.out.println("No");
        }else{
            System.out.println("Yes");
        }

    }
} public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int M = sc.nextInt();
        Integer A[]= new Integer[N];
        int sum = 0;
        for(int i=0;i<N;i++){
            A[i] = sc.nextInt();
            sum += A[i];
        }
        Arrays.sort(A,Collections.reverseOrder());
        int b = A[M-1]*4*M;
        if(b<sum){
            System.out.println("No");
        }else{
            System.out.println("Yes");
        }

    }
} 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();
        Integer A[]= new Integer[N];
        int sum = 0;
        for(int i=0;i<N;i++){
            A[i] = sc.nextInt();
            sum += A[i];
        }
        Arrays.sort(A,Collections.reverseOrder());
        int b = A[M-1]*4*M;
        if(b<sum){
            System.out.println("No");
        }else{
            System.out.println("Yes");
        }

    }
}