#include<stdio.h>

int main(void) {
	int N, M, i, p, s;
	int a[1000];
	float t;
	p = 0;
	s = 0;
	scanf("%d %d", &N, &M);
	for (i = 0; i < N; i++) {
		scanf("%d", &a[i]);
		s += a[i];
	}
	t = s / (4 * M);
	for (i = 0; i < N; i++) {
		if (a[i] >= t)
			p++;
	}
	if (p >= M)
		printf("Yes");
	else
		printf("No");
	return 0;
}