#include <stdio.h>
int main() {
	int n, m, a[100], cou = 0, sum = 0;
	scanf("%d%d", &n, &m);
	for (int i = 0; i < n; i++) {
		scanf("%d", &a[i]);
		sum += a[i];
	}
	for (int i = 0; i < n; i++) {
		if (a[i] >= (double)sum / (4 * m)) {
			cou++;
		}
	}
	printf("%s\n", m <= cou ? "Yes" : "No");
	return 0;
}