import java.util.*;


public class Main {
    public static void main(String[] args) {
      
      Scanner sc = new Scanner(System.in);
      int n = Integer.parseInt(sc.next());
      double m = Double.parseDouble(sc.next());
      double[] ary = new double[n];
      double sum = 0.0;
      double c = 0.0;
      for (int i = 0;i < n;i++) {
        ary[i] = Double.parseDouble(sc.next());
        sum += ary[i];
      }
      for (int i = 0; i < n  ; i++) {
        if (ary[i] >= sum / ( 4* m)) {
          c += 1;
        }
      }
      if (c >= m) {
        System.out.println("Yes");
      } else {
        System.out.println("No");
      }
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
      
      Scanner sc = new Scanner(System.in);
      int n = Integer.parseInt(sc.next());
      double m = Double.parseDouble(sc.next());
      double[] ary = new double[n];
      double sum = 0.0;
      double c = 0.0;
      for (int i = 0;i < n;i++) {
        ary[i] = Double.parseDouble(sc.next());
        sum += ary[i];
      }
      for (int i = 0; i < n  ; i++) {
        if (ary[i] >= sum / ( 4* m)) {
          c += 1;
        }
      }
      if (c >= m) {
        System.out.println("Yes");
      } else {
        System.out.println("No");
      }
    }
} Main public static void main(String[] args) {
      
      Scanner sc = new Scanner(System.in);
      int n = Integer.parseInt(sc.next());
      double m = Double.parseDouble(sc.next());
      double[] ary = new double[n];
      double sum = 0.0;
      double c = 0.0;
      for (int i = 0;i < n;i++) {
        ary[i] = Double.parseDouble(sc.next());
        sum += ary[i];
      }
      for (int i = 0; i < n  ; i++) {
        if (ary[i] >= sum / ( 4* m)) {
          c += 1;
        }
      }
      if (c >= m) {
        System.out.println("Yes");
      } else {
        System.out.println("No");
      }
    } main {
      
      Scanner sc = new Scanner(System.in);
      int n = Integer.parseInt(sc.next());
      double m = Double.parseDouble(sc.next());
      double[] ary = new double[n];
      double sum = 0.0;
      double c = 0.0;
      for (int i = 0;i < n;i++) {
        ary[i] = Double.parseDouble(sc.next());
        sum += ary[i];
      }
      for (int i = 0; i < n  ; i++) {
        if (ary[i] >= sum / ( 4* m)) {
          c += 1;
        }
      }
      if (c >= m) {
        System.out.println("Yes");
      } else {
        System.out.println("No");
      }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = Integer.parseInt(sc.next()); n Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc double m = Double.parseDouble(sc.next()); m Double.parseDouble(sc.next()) Double.parseDouble Double sc.next() sc.next sc double[] ary = new double[n]; ary new double[n] n double sum = 0.0; sum 0.0 double c = 0.0; c 0.0 for (int i = 0;i < n;i++) {
        ary[i] = Double.parseDouble(sc.next());
        sum += ary[i];
      } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
        ary[i] = Double.parseDouble(sc.next());
        sum += ary[i];
      } {
        ary[i] = Double.parseDouble(sc.next());
        sum += ary[i];
      } ary[i] = Double.parseDouble(sc.next()) ary[i] ary i Double.parseDouble(sc.next()) Double.parseDouble Double sc.next() sc.next sc sum += ary[i] sum ary[i] ary i for (int i = 0; i < n  ; i++) {
        if (ary[i] >= sum / ( 4* m)) {
          c += 1;
        }
      } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
        if (ary[i] >= sum / ( 4* m)) {
          c += 1;
        }
      } {
        if (ary[i] >= sum / ( 4* m)) {
          c += 1;
        }
      } if (ary[i] >= sum / ( 4* m)) {
          c += 1;
        } ary[i] >= sum / ( 4* m) ary[i] ary i sum / ( 4* m) sum ( 4* m) 4 m {
          c += 1;
        } c += 1 c 1 if (c >= m) {
        System.out.println("Yes");
      } else {
        System.out.println("No");
      } c >= m c 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) {
      
      Scanner sc = new Scanner(System.in);
      int n = Integer.parseInt(sc.next());
      double m = Double.parseDouble(sc.next());
      double[] ary = new double[n];
      double sum = 0.0;
      double c = 0.0;
      for (int i = 0;i < n;i++) {
        ary[i] = Double.parseDouble(sc.next());
        sum += ary[i];
      }
      for (int i = 0; i < n  ; i++) {
        if (ary[i] >= sum / ( 4* m)) {
          c += 1;
        }
      }
      if (c >= m) {
        System.out.println("Yes");
      } else {
        System.out.println("No");
      }
    }
} public class Main {
    public static void main(String[] args) {
      
      Scanner sc = new Scanner(System.in);
      int n = Integer.parseInt(sc.next());
      double m = Double.parseDouble(sc.next());
      double[] ary = new double[n];
      double sum = 0.0;
      double c = 0.0;
      for (int i = 0;i < n;i++) {
        ary[i] = Double.parseDouble(sc.next());
        sum += ary[i];
      }
      for (int i = 0; i < n  ; i++) {
        if (ary[i] >= sum / ( 4* m)) {
          c += 1;
        }
      }
      if (c >= m) {
        System.out.println("Yes");
      } else {
        System.out.println("No");
      }
    }
} Main
import java.util.*;


public class Main {
    public static void main(String[] args) {
      
      Scanner sc = new Scanner(System.in);
      int n = Integer.parseInt(sc.next());
      double m = Double.parseDouble(sc.next());
      double[] ary = new double[n];
      double sum = 0.0;
      double c = 0.0;
      for (int i = 0;i < n;i++) {
        ary[i] = Double.parseDouble(sc.next());
        sum += ary[i];
      }
      for (int i = 0; i < n  ; i++) {
        if (ary[i] >= sum / ( 4* m)) {
          c += 1;
        }
      }
      if (c >= m) {
        System.out.println("Yes");
      } else {
        System.out.println("No");
      }
    }
}