import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.Collections;

public class Main {

	public static void main(String[] args) throws IOException {
			BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
			String W = in.readLine();

			int N = Integer.parseInt(W.split(" ")[0]);
			int M = Integer.parseInt(W.split(" ")[1]);

			Integer[] A = new Integer[N];

			String Y = in.readLine();
			for(int i = 0; i < N; i++) {
				A[i] = Integer.parseInt(Y.split(" ")[i]);
			}

			long sum = 0;
			for(long i:A) {
			sum+=i;
			}


			 Arrays.sort(A, Collections.reverseOrder());

			if(A[M -1] >= (double)sum/(4*M)) {
				System.out.println("Yes");
			}else {
				System.out.println("No");
			}

	}

} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io import java.util.Arrays; Arrays java.util import java.util.Collections; Collections java.util public class Main {

	public static void main(String[] args) throws IOException {
			BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
			String W = in.readLine();

			int N = Integer.parseInt(W.split(" ")[0]);
			int M = Integer.parseInt(W.split(" ")[1]);

			Integer[] A = new Integer[N];

			String Y = in.readLine();
			for(int i = 0; i < N; i++) {
				A[i] = Integer.parseInt(Y.split(" ")[i]);
			}

			long sum = 0;
			for(long i:A) {
			sum+=i;
			}


			 Arrays.sort(A, Collections.reverseOrder());

			if(A[M -1] >= (double)sum/(4*M)) {
				System.out.println("Yes");
			}else {
				System.out.println("No");
			}

	}

} Main public static void main(String[] args) throws IOException {
			BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
			String W = in.readLine();

			int N = Integer.parseInt(W.split(" ")[0]);
			int M = Integer.parseInt(W.split(" ")[1]);

			Integer[] A = new Integer[N];

			String Y = in.readLine();
			for(int i = 0; i < N; i++) {
				A[i] = Integer.parseInt(Y.split(" ")[i]);
			}

			long sum = 0;
			for(long i:A) {
			sum+=i;
			}


			 Arrays.sort(A, Collections.reverseOrder());

			if(A[M -1] >= (double)sum/(4*M)) {
				System.out.println("Yes");
			}else {
				System.out.println("No");
			}

	} main {
			BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
			String W = in.readLine();

			int N = Integer.parseInt(W.split(" ")[0]);
			int M = Integer.parseInt(W.split(" ")[1]);

			Integer[] A = new Integer[N];

			String Y = in.readLine();
			for(int i = 0; i < N; i++) {
				A[i] = Integer.parseInt(Y.split(" ")[i]);
			}

			long sum = 0;
			for(long i:A) {
			sum+=i;
			}


			 Arrays.sort(A, Collections.reverseOrder());

			if(A[M -1] >= (double)sum/(4*M)) {
				System.out.println("Yes");
			}else {
				System.out.println("No");
			}

	} BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); in new BufferedReader(new InputStreamReader(System.in)) String W = in.readLine(); W in.readLine() in.readLine in int N = Integer.parseInt(W.split(" ")[0]); N Integer.parseInt(W.split(" ")[0]) Integer.parseInt Integer W.split(" ")[0] W.split(" ") W.split W " " 0 int M = Integer.parseInt(W.split(" ")[1]); M Integer.parseInt(W.split(" ")[1]) Integer.parseInt Integer W.split(" ")[1] W.split(" ") W.split W " " 1 Integer[] A = new Integer[N]; A new Integer[N] N String Y = in.readLine(); Y in.readLine() in.readLine in for(int i = 0; i < N; i++) {
				A[i] = Integer.parseInt(Y.split(" ")[i]);
			} int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
				A[i] = Integer.parseInt(Y.split(" ")[i]);
			} {
				A[i] = Integer.parseInt(Y.split(" ")[i]);
			} A[i] = Integer.parseInt(Y.split(" ")[i]) A[i] A i Integer.parseInt(Y.split(" ")[i]) Integer.parseInt Integer Y.split(" ")[i] Y.split(" ") Y.split Y " " i long sum = 0; sum 0 for(long i:A) {
			sum+=i;
			} long i A {
			sum+=i;
			} {
			sum+=i;
			} sum+=i sum i Arrays.sort(A, Collections.reverseOrder()) Arrays.sort Arrays A Collections.reverseOrder() Collections.reverseOrder Collections if(A[M -1] >= (double)sum/(4*M)) {
				System.out.println("Yes");
			}else {
				System.out.println("No");
			} A[M -1] >= (double)sum/(4*M) A[M -1] A M -1 M 1 (double)sum/(4*M) (double)sum (4*M) 4 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) throws IOException {
			BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
			String W = in.readLine();

			int N = Integer.parseInt(W.split(" ")[0]);
			int M = Integer.parseInt(W.split(" ")[1]);

			Integer[] A = new Integer[N];

			String Y = in.readLine();
			for(int i = 0; i < N; i++) {
				A[i] = Integer.parseInt(Y.split(" ")[i]);
			}

			long sum = 0;
			for(long i:A) {
			sum+=i;
			}


			 Arrays.sort(A, Collections.reverseOrder());

			if(A[M -1] >= (double)sum/(4*M)) {
				System.out.println("Yes");
			}else {
				System.out.println("No");
			}

	}

} public class Main {

	public static void main(String[] args) throws IOException {
			BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
			String W = in.readLine();

			int N = Integer.parseInt(W.split(" ")[0]);
			int M = Integer.parseInt(W.split(" ")[1]);

			Integer[] A = new Integer[N];

			String Y = in.readLine();
			for(int i = 0; i < N; i++) {
				A[i] = Integer.parseInt(Y.split(" ")[i]);
			}

			long sum = 0;
			for(long i:A) {
			sum+=i;
			}


			 Arrays.sort(A, Collections.reverseOrder());

			if(A[M -1] >= (double)sum/(4*M)) {
				System.out.println("Yes");
			}else {
				System.out.println("No");
			}

	}

} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.Collections;

public class Main {

	public static void main(String[] args) throws IOException {
			BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
			String W = in.readLine();

			int N = Integer.parseInt(W.split(" ")[0]);
			int M = Integer.parseInt(W.split(" ")[1]);

			Integer[] A = new Integer[N];

			String Y = in.readLine();
			for(int i = 0; i < N; i++) {
				A[i] = Integer.parseInt(Y.split(" ")[i]);
			}

			long sum = 0;
			for(long i:A) {
			sum+=i;
			}


			 Arrays.sort(A, Collections.reverseOrder());

			if(A[M -1] >= (double)sum/(4*M)) {
				System.out.println("Yes");
			}else {
				System.out.println("No");
			}

	}

}
