import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws Exception {

//    	File file = new File("test.txt");
//    	Scanner sc = new Scanner(file);
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int m = sc.nextInt();
        int[] ary = new int[n];
        long sum = 0;
        for(int i = 0;i < n; i++){
        	ary[i] = sc.nextInt();
        	sum += ary[i];
        }
        sc.close();
        int m2 = 0;
        for(int i = 0;i < n; i++){
        	if(ary[i]*(4*m) >= sum){
        		m2++;
        	}
        }
        System.out.println(m2>=m?"Yes":"No");

    }
}
/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