import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st = new StringTokenizer(br.readLine());
		int N = Integer.parseInt(st.nextToken());
		int M = Integer.parseInt(st.nextToken());
		int[] arr = new int[N];
		st = new StringTokenizer(br.readLine());
		int sum = 0;
		for (int i = 0; i < N; i++) {
			arr[i] = Integer.parseInt(st.nextToken());
			sum += arr[i];
		}
		double val = ((double) sum) / (4.0 * (double) M);
		int count = 0;
		for (int i = 0; i < N; i++) {
			if (arr[i] >= val) {
				count++;
			}
		}
		System.out.println(count < M ? "No" : "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