#include<stdio.h>
int main()
{
	double n, m, x[1001], sum = 0, ok = 0, key;

	scanf("%lf %lf", &n, &m);

	for (int i = 0; i < n; i++) {
		scanf("%lf", &x[i]);
		sum += x[i];
	}

	key = sum / (4 * m);

	for (int i = 0; i < n; i++) {
		if (x[i] >= key) ok++;
	}
	if (ok >= m) {
		printf("Yes");
	}
	else {
		printf("No");
	}

	return 0;
}