#include <stdio.h>
int n, m, s, x;
int a[1000];
int main() {
	scanf("%d%d", &n, &m);
	for (int i = 0; i < n; i++) {
		scanf("%d", a + i);
		s += a[i];
	}
	for (int i = 0; i < n; i++) {
		if (s <= 4 * m * a[i])x++;
	}
	if (x >= m)printf("Yes\n");
	else printf("No\n");
}