import java.util.Scanner;

class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int m = sc.nextInt();
		int[] a = new int[n];
		int voteSum = 0;

		for(int i = 0; i < n; i++){
			a[i] = sc.nextInt();
			voteSum += a[i];
		}

		for(int i = 0; i < n-1; i++){
			for(int j = i + 1; j < n; j++){
				if(a[i] < a[j]){
					int box = a[i];
					a[i] = a[j];
					a[j] = box;
				}
			}
		}

		if(a[m - 1] < ((double)voteSum/(4 * (double)m))){
			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