#include<stdio.h>
#include<stdlib.h>

int main()
{
	int n, m, i;
	int a[1000];
	int s = 0;
	int f = 0;
	scanf("%d %d", &n, &m);
	
	for(i = 0; i < n; i++)
	{
		scanf("%d", a + i);
		s += a[i];
	}
	
	double sm = s / (double) (4 * m);
	for(i = 0; i < n; i++)
	{
		if(sm <= a[i])
		{
			f++;
		}
	}
	if(f >= m) printf("Yes");
	else printf("No");
}