import java.util.*;
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 total = 0;
        for(int i=0; i<N; i++){
            A[i] = sc.nextInt();
            total += A[i];
        }
        double benchmark = (double)total/(M*4);
        int ok = 0;
        for(int i=0; i<N; i++){
            if(A[i] >= benchmark){
                ok++;
            }
        }
        if(ok>=M){
            System.out.println("Yes");
        }else System.out.println("No");

    }    
} import java.util.*; util.* java 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 total = 0;
        for(int i=0; i<N; i++){
            A[i] = sc.nextInt();
            total += A[i];
        }
        double benchmark = (double)total/(M*4);
        int ok = 0;
        for(int i=0; i<N; i++){
            if(A[i] >= benchmark){
                ok++;
            }
        }
        if(ok>=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 total = 0;
        for(int i=0; i<N; i++){
            A[i] = sc.nextInt();
            total += A[i];
        }
        double benchmark = (double)total/(M*4);
        int ok = 0;
        for(int i=0; i<N; i++){
            if(A[i] >= benchmark){
                ok++;
            }
        }
        if(ok>=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 total = 0;
        for(int i=0; i<N; i++){
            A[i] = sc.nextInt();
            total += A[i];
        }
        double benchmark = (double)total/(M*4);
        int ok = 0;
        for(int i=0; i<N; i++){
            if(A[i] >= benchmark){
                ok++;
            }
        }
        if(ok>=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 total = 0; total 0 for(int i=0; i<N; i++){
            A[i] = sc.nextInt();
            total += A[i];
        } int i=0; int i=0; i 0 i<N i N i++ i++ i {
            A[i] = sc.nextInt();
            total += A[i];
        } {
            A[i] = sc.nextInt();
            total += A[i];
        } A[i] = sc.nextInt() A[i] A i sc.nextInt() sc.nextInt sc total += A[i] total A[i] A i double benchmark = (double)total/(M*4); benchmark (double)total/(M*4) (double)total (M*4) M 4 int ok = 0; ok 0 for(int i=0; i<N; i++){
            if(A[i] >= benchmark){
                ok++;
            }
        } int i=0; int i=0; i 0 i<N i N i++ i++ i {
            if(A[i] >= benchmark){
                ok++;
            }
        } {
            if(A[i] >= benchmark){
                ok++;
            }
        } if(A[i] >= benchmark){
                ok++;
            } A[i] >= benchmark A[i] A i benchmark {
                ok++;
            } ok++ ok if(ok>=M){
            System.out.println("Yes");
        }else System.out.println("No"); ok>=M ok 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 System.out System System.out "No" String args[] args
import java.util.*;
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 total = 0;
        for(int i=0; i<N; i++){
            A[i] = sc.nextInt();
            total += A[i];
        }
        double benchmark = (double)total/(M*4);
        int ok = 0;
        for(int i=0; i<N; i++){
            if(A[i] >= benchmark){
                ok++;
            }
        }
        if(ok>=M){
            System.out.println("Yes");
        }else System.out.println("No");

    }    
}