#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <limits.h>

int main(void)
{
	int n, m, sum = 0, ret = 0;
	int arr[100];
	scanf("%d %d", &n, &m);

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

	for (int i = 0; i < n; i++)
	{
		if (arr[i] >= (double)sum / (4 * m))
			ret++;
	}

	if (ret >= m)
		printf("Yes");
	else
		printf("No");

	return 0;
}
