import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		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];
		}
		Arrays.sort(A);
		if (A[N - M] >= sum / (4 * (double) M)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
} import java.util.Arrays; Arrays java.util import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) throws Exception {
		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];
		}
		Arrays.sort(A);
		if (A[N - M] >= sum / (4 * (double) M)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
} Main public static void main(String[] args) throws Exception {
		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];
		}
		Arrays.sort(A);
		if (A[N - M] >= sum / (4 * (double) 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];
		}
		Arrays.sort(A);
		if (A[N - M] >= sum / (4 * (double) 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 Arrays.sort(A) Arrays.sort Arrays A if (A[N - M] >= sum / (4 * (double) M)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		} A[N - M] >= sum / (4 * (double) M) A[N - M] A N - M N M sum / (4 * (double) M) sum (4 * (double) M) 4 (double) 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 Exception {
		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];
		}
		Arrays.sort(A);
		if (A[N - M] >= sum / (4 * (double) M)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
} public class Main {
	public static void main(String[] args) throws Exception {
		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];
		}
		Arrays.sort(A);
		if (A[N - M] >= sum / (4 * (double) M)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
} Main
import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		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];
		}
		Arrays.sort(A);
		if (A[N - M] >= sum / (4 * (double) M)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
}
