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 count;
		String ans;
		int sumA = 0;
		for (int i = 0; i < N; i++) {
			int a = sc.nextInt();
			A[i] = a;
			sumA += a;
		}
		Arrays.sort(A,Collections.reverseOrder());
		if (A[M-1] >= ((double)(double)sumA/(4*(double)M))) {
      ans = "Yes";
		} else {
			ans = "No";
		}
		System.out.println(ans);
  }
} 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 count;
		String ans;
		int sumA = 0;
		for (int i = 0; i < N; i++) {
			int a = sc.nextInt();
			A[i] = a;
			sumA += a;
		}
		Arrays.sort(A,Collections.reverseOrder());
		if (A[M-1] >= ((double)(double)sumA/(4*(double)M))) {
      ans = "Yes";
		} else {
			ans = "No";
		}
		System.out.println(ans);
  }
} 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 count;
		String ans;
		int sumA = 0;
		for (int i = 0; i < N; i++) {
			int a = sc.nextInt();
			A[i] = a;
			sumA += a;
		}
		Arrays.sort(A,Collections.reverseOrder());
		if (A[M-1] >= ((double)(double)sumA/(4*(double)M))) {
      ans = "Yes";
		} else {
			ans = "No";
		}
		System.out.println(ans);
  } main {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int M = sc.nextInt();
		Integer[] A = new Integer [N];
		int count;
		String ans;
		int sumA = 0;
		for (int i = 0; i < N; i++) {
			int a = sc.nextInt();
			A[i] = a;
			sumA += a;
		}
		Arrays.sort(A,Collections.reverseOrder());
		if (A[M-1] >= ((double)(double)sumA/(4*(double)M))) {
      ans = "Yes";
		} else {
			ans = "No";
		}
		System.out.println(ans);
  } 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 count; count String ans; ans int sumA = 0; sumA 0 for (int i = 0; i < N; i++) {
			int a = sc.nextInt();
			A[i] = a;
			sumA += a;
		} int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
			int a = sc.nextInt();
			A[i] = a;
			sumA += a;
		} {
			int a = sc.nextInt();
			A[i] = a;
			sumA += a;
		} int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc A[i] = a A[i] A i a sumA += a sumA a Arrays.sort(A,Collections.reverseOrder()) Arrays.sort Arrays A Collections.reverseOrder() Collections.reverseOrder Collections if (A[M-1] >= ((double)(double)sumA/(4*(double)M))) {
      ans = "Yes";
		} else {
			ans = "No";
		} A[M-1] >= ((double)(double)sumA/(4*(double)M)) A[M-1] A M-1 M 1 ((double)(double)sumA/(4*(double)M)) (double)(double)sumA (4*(double)M) 4 (double)M {
      ans = "Yes";
		} ans = "Yes" ans "Yes" {
			ans = "No";
		} ans = "No" ans "No" System.out.println(ans) System.out.println System.out System System.out ans 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 count;
		String ans;
		int sumA = 0;
		for (int i = 0; i < N; i++) {
			int a = sc.nextInt();
			A[i] = a;
			sumA += a;
		}
		Arrays.sort(A,Collections.reverseOrder());
		if (A[M-1] >= ((double)(double)sumA/(4*(double)M))) {
      ans = "Yes";
		} else {
			ans = "No";
		}
		System.out.println(ans);
  }
} 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 count;
		String ans;
		int sumA = 0;
		for (int i = 0; i < N; i++) {
			int a = sc.nextInt();
			A[i] = a;
			sumA += a;
		}
		Arrays.sort(A,Collections.reverseOrder());
		if (A[M-1] >= ((double)(double)sumA/(4*(double)M))) {
      ans = "Yes";
		} else {
			ans = "No";
		}
		System.out.println(ans);
  }
} 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 count;
		String ans;
		int sumA = 0;
		for (int i = 0; i < N; i++) {
			int a = sc.nextInt();
			A[i] = a;
			sumA += a;
		}
		Arrays.sort(A,Collections.reverseOrder());
		if (A[M-1] >= ((double)(double)sumA/(4*(double)M))) {
      ans = "Yes";
		} else {
			ans = "No";
		}
		System.out.println(ans);
  }
}