import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Scanner;

public class Main {

	static final boolean debugMode = false;

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int n = readInt(sc);
		int m = readInt(sc);
		int total = 0;

		List<Integer> a = new ArrayList<Integer>();
		for (int i = 0; i < n; i++) {
			int tmp = readInt(sc);
			total += tmp;
			a.add(tmp);
		}

		a.sort(Comparator.reverseOrder());
		if (a.get(m - 1) >= (double)total / (double)(4 * m)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
		
	}

	static int readInt(Scanner sc) {
		return Integer.parseInt(sc.next());
	}

	static void log(String s) {
		if (debugMode) {
			System.out.println(s);
		}
		return;
	}
}

class Pair {
	private int x;
	private int y;

	public int getX() {
		return x;
	}

	public void setX(int x) {
		this.x = x;
	}

	public int getY() {
		return y;
	}

	public void setY(int y) {
		this.y = y;
	}

	public Pair() {

	}

	public Pair(int x, int y) {
		this.x = x;
		this.y = y;
	}

} import java.util.ArrayList; ArrayList java.util import java.util.Collections; Collections java.util import java.util.Comparator; Comparator java.util import java.util.List; List java.util import java.util.Scanner; Scanner java.util public class Main {

	static final boolean debugMode = false;

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int n = readInt(sc);
		int m = readInt(sc);
		int total = 0;

		List<Integer> a = new ArrayList<Integer>();
		for (int i = 0; i < n; i++) {
			int tmp = readInt(sc);
			total += tmp;
			a.add(tmp);
		}

		a.sort(Comparator.reverseOrder());
		if (a.get(m - 1) >= (double)total / (double)(4 * m)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
		
	}

	static int readInt(Scanner sc) {
		return Integer.parseInt(sc.next());
	}

	static void log(String s) {
		if (debugMode) {
			System.out.println(s);
		}
		return;
	}
} Main static final boolean debugMode = false; debugMode false public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int n = readInt(sc);
		int m = readInt(sc);
		int total = 0;

		List<Integer> a = new ArrayList<Integer>();
		for (int i = 0; i < n; i++) {
			int tmp = readInt(sc);
			total += tmp;
			a.add(tmp);
		}

		a.sort(Comparator.reverseOrder());
		if (a.get(m - 1) >= (double)total / (double)(4 * m)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
		
	} main {
		Scanner sc = new Scanner(System.in);

		int n = readInt(sc);
		int m = readInt(sc);
		int total = 0;

		List<Integer> a = new ArrayList<Integer>();
		for (int i = 0; i < n; i++) {
			int tmp = readInt(sc);
			total += tmp;
			a.add(tmp);
		}

		a.sort(Comparator.reverseOrder());
		if (a.get(m - 1) >= (double)total / (double)(4 * m)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
		
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = readInt(sc); n readInt(sc) readInt sc int m = readInt(sc); m readInt(sc) readInt sc int total = 0; total 0 List<Integer> a = new ArrayList<Integer>(); a new ArrayList<Integer>() for (int i = 0; i < n; i++) {
			int tmp = readInt(sc);
			total += tmp;
			a.add(tmp);
		} int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
			int tmp = readInt(sc);
			total += tmp;
			a.add(tmp);
		} {
			int tmp = readInt(sc);
			total += tmp;
			a.add(tmp);
		} int tmp = readInt(sc); tmp readInt(sc) readInt sc total += tmp total tmp a.add(tmp) a.add a tmp a.sort(Comparator.reverseOrder()) a.sort a Comparator.reverseOrder() Comparator.reverseOrder Comparator if (a.get(m - 1) >= (double)total / (double)(4 * m)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		} a.get(m - 1) >= (double)total / (double)(4 * m) a.get(m - 1) a.get a m - 1 m 1 (double)total / (double)(4 * m) (double)total (double)(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 static int readInt(Scanner sc) {
		return Integer.parseInt(sc.next());
	} readInt {
		return Integer.parseInt(sc.next());
	} return Integer.parseInt(sc.next()); Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc Scanner sc sc static void log(String s) {
		if (debugMode) {
			System.out.println(s);
		}
		return;
	} log {
		if (debugMode) {
			System.out.println(s);
		}
		return;
	} if (debugMode) {
			System.out.println(s);
		} debugMode {
			System.out.println(s);
		} System.out.println(s) System.out.println System.out System System.out s return; String s s class Pair {
	private int x;
	private int y;

	public int getX() {
		return x;
	}

	public void setX(int x) {
		this.x = x;
	}

	public int getY() {
		return y;
	}

	public void setY(int y) {
		this.y = y;
	}

	public Pair() {

	}

	public Pair(int x, int y) {
		this.x = x;
		this.y = y;
	}

} Pair private int x; x private int y; y public int getX() {
		return x;
	} getX {
		return x;
	} return x; x public void setX(int x) {
		this.x = x;
	} setX {
		this.x = x;
	} this.x = x this.x this this.x x int x x public int getY() {
		return y;
	} getY {
		return y;
	} return y; y public void setY(int y) {
		this.y = y;
	} setY {
		this.y = y;
	} this.y = y this.y this this.y y int y y public Pair() {

	} Pair {

	} public Pair(int x, int y) {
		this.x = x;
		this.y = y;
	} Pair {
		this.x = x;
		this.y = y;
	} this.x = x this.x this this.x x this.y = y this.y this this.y y int x x int y y public class Main {

	static final boolean debugMode = false;

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int n = readInt(sc);
		int m = readInt(sc);
		int total = 0;

		List<Integer> a = new ArrayList<Integer>();
		for (int i = 0; i < n; i++) {
			int tmp = readInt(sc);
			total += tmp;
			a.add(tmp);
		}

		a.sort(Comparator.reverseOrder());
		if (a.get(m - 1) >= (double)total / (double)(4 * m)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
		
	}

	static int readInt(Scanner sc) {
		return Integer.parseInt(sc.next());
	}

	static void log(String s) {
		if (debugMode) {
			System.out.println(s);
		}
		return;
	}
} public class Main {

	static final boolean debugMode = false;

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int n = readInt(sc);
		int m = readInt(sc);
		int total = 0;

		List<Integer> a = new ArrayList<Integer>();
		for (int i = 0; i < n; i++) {
			int tmp = readInt(sc);
			total += tmp;
			a.add(tmp);
		}

		a.sort(Comparator.reverseOrder());
		if (a.get(m - 1) >= (double)total / (double)(4 * m)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
		
	}

	static int readInt(Scanner sc) {
		return Integer.parseInt(sc.next());
	}

	static void log(String s) {
		if (debugMode) {
			System.out.println(s);
		}
		return;
	}
} Main
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Scanner;

public class Main {

	static final boolean debugMode = false;

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int n = readInt(sc);
		int m = readInt(sc);
		int total = 0;

		List<Integer> a = new ArrayList<Integer>();
		for (int i = 0; i < n; i++) {
			int tmp = readInt(sc);
			total += tmp;
			a.add(tmp);
		}

		a.sort(Comparator.reverseOrder());
		if (a.get(m - 1) >= (double)total / (double)(4 * m)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
		
	}

	static int readInt(Scanner sc) {
		return Integer.parseInt(sc.next());
	}

	static void log(String s) {
		if (debugMode) {
			System.out.println(s);
		}
		return;
	}
}

class Pair {
	private int x;
	private int y;

	public int getX() {
		return x;
	}

	public void setX(int x) {
		this.x = x;
	}

	public int getY() {
		return y;
	}

	public void setY(int y) {
		this.y = y;
	}

	public Pair() {

	}

	public Pair(int x, int y) {
		this.x = x;
		this.y = y;
	}

}