import java.util.*;
import java.io.*;
 
public class Main {
    public static void main (final String[] args) {
        final Scanner s = new Scanner(System.in);
          int n = Integer.parseInt(s.next());
      	  int m = Integer.parseInt(s.next());
      	
      	int[] vote = new int[n];
      	int sum = 0;
      	for(int i = 0; i < n; i++) {
          vote[i] = Integer.parseInt(s.next());
          sum += vote[i];
        }
      	
      	Arrays.sort(vote);
      
      	if ((double)vote[n-m] >= (double)sum/(4*(double)m)) System.out.println("Yes");
      	else System.out.println("No");
    }
} import java.util.*; util.* java import java.io.*; io.* java public class Main {
    public static void main (final String[] args) {
        final Scanner s = new Scanner(System.in);
          int n = Integer.parseInt(s.next());
      	  int m = Integer.parseInt(s.next());
      	
      	int[] vote = new int[n];
      	int sum = 0;
      	for(int i = 0; i < n; i++) {
          vote[i] = Integer.parseInt(s.next());
          sum += vote[i];
        }
      	
      	Arrays.sort(vote);
      
      	if ((double)vote[n-m] >= (double)sum/(4*(double)m)) System.out.println("Yes");
      	else System.out.println("No");
    }
} Main public static void main (final String[] args) {
        final Scanner s = new Scanner(System.in);
          int n = Integer.parseInt(s.next());
      	  int m = Integer.parseInt(s.next());
      	
      	int[] vote = new int[n];
      	int sum = 0;
      	for(int i = 0; i < n; i++) {
          vote[i] = Integer.parseInt(s.next());
          sum += vote[i];
        }
      	
      	Arrays.sort(vote);
      
      	if ((double)vote[n-m] >= (double)sum/(4*(double)m)) System.out.println("Yes");
      	else System.out.println("No");
    } main {
        final Scanner s = new Scanner(System.in);
          int n = Integer.parseInt(s.next());
      	  int m = Integer.parseInt(s.next());
      	
      	int[] vote = new int[n];
      	int sum = 0;
      	for(int i = 0; i < n; i++) {
          vote[i] = Integer.parseInt(s.next());
          sum += vote[i];
        }
      	
      	Arrays.sort(vote);
      
      	if ((double)vote[n-m] >= (double)sum/(4*(double)m)) System.out.println("Yes");
      	else System.out.println("No");
    } final Scanner s = new Scanner(System.in); s new Scanner(System.in) int n = Integer.parseInt(s.next()); n Integer.parseInt(s.next()) Integer.parseInt Integer s.next() s.next s int m = Integer.parseInt(s.next()); m Integer.parseInt(s.next()) Integer.parseInt Integer s.next() s.next s int[] vote = new int[n]; vote new int[n] n int sum = 0; sum 0 for(int i = 0; i < n; i++) {
          vote[i] = Integer.parseInt(s.next());
          sum += vote[i];
        } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
          vote[i] = Integer.parseInt(s.next());
          sum += vote[i];
        } {
          vote[i] = Integer.parseInt(s.next());
          sum += vote[i];
        } vote[i] = Integer.parseInt(s.next()) vote[i] vote i Integer.parseInt(s.next()) Integer.parseInt Integer s.next() s.next s sum += vote[i] sum vote[i] vote i Arrays.sort(vote) Arrays.sort Arrays vote if ((double)vote[n-m] >= (double)sum/(4*(double)m)) System.out.println("Yes");
      	else System.out.println("No"); (double)vote[n-m] >= (double)sum/(4*(double)m) (double)vote[n-m] vote n-m n m (double)sum/(4*(double)m) (double)sum (4*(double)m) 4 (double)m 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" final String[] args args public class Main {
    public static void main (final String[] args) {
        final Scanner s = new Scanner(System.in);
          int n = Integer.parseInt(s.next());
      	  int m = Integer.parseInt(s.next());
      	
      	int[] vote = new int[n];
      	int sum = 0;
      	for(int i = 0; i < n; i++) {
          vote[i] = Integer.parseInt(s.next());
          sum += vote[i];
        }
      	
      	Arrays.sort(vote);
      
      	if ((double)vote[n-m] >= (double)sum/(4*(double)m)) System.out.println("Yes");
      	else System.out.println("No");
    }
} public class Main {
    public static void main (final String[] args) {
        final Scanner s = new Scanner(System.in);
          int n = Integer.parseInt(s.next());
      	  int m = Integer.parseInt(s.next());
      	
      	int[] vote = new int[n];
      	int sum = 0;
      	for(int i = 0; i < n; i++) {
          vote[i] = Integer.parseInt(s.next());
          sum += vote[i];
        }
      	
      	Arrays.sort(vote);
      
      	if ((double)vote[n-m] >= (double)sum/(4*(double)m)) System.out.println("Yes");
      	else System.out.println("No");
    }
} Main
import java.util.*;
import java.io.*;
 
public class Main {
    public static void main (final String[] args) {
        final Scanner s = new Scanner(System.in);
          int n = Integer.parseInt(s.next());
      	  int m = Integer.parseInt(s.next());
      	
      	int[] vote = new int[n];
      	int sum = 0;
      	for(int i = 0; i < n; i++) {
          vote[i] = Integer.parseInt(s.next());
          sum += vote[i];
        }
      	
      	Arrays.sort(vote);
      
      	if ((double)vote[n-m] >= (double)sum/(4*(double)m)) System.out.println("Yes");
      	else System.out.println("No");
    }
}