import java.util.*;

public class Main {
    public static void main(String args[]) {
        //ArrayList<Integer> array = new ArrayList<Integer>();
        
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int m = sc.nextInt();
        
        int sum = 0;
        
        Integer[] array = new Integer[n];
        for(int i = 0; i < n; ++i) {
            int item = sc.nextInt();
            array[i] = item;
            
            // 要素の総和を求める
            sum += item;
        }
        
        // 読み込んだ配列を降順にソートする
        Arrays.sort(array, Collections.reverseOrder()); 
        
        double item_v = sum / (4d * m);
        
        if(array[m - 1] < item_v ) System.out.println("No");
        else System.out.println("Yes");
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz