#include<stdio.h>

int main()
{
	int n,m;
	scanf("%d %d", &n, &m);
	float item[n];
	float total=0;
	for(int i = 0; i<n;i++)
	{
		scanf("%f", &item[i]);
		total += item[i];
	}
	float min = total/(4*m);
	int sudah = 0;
	for(int j = 0; j<n;j++)
	{
		if(sudah>=m) break;
		if(item[j] >= min) sudah++;
	}
	
	if(sudah >= m) printf("Yes\n");
	else printf("No\n");
}