#include<cstdio>
#include<algorithm>
using namespace std;
bool cmp(int a,int b)
{return a>b;}
int main()
{
	int m,n,a[1005],i;
	double sum=0.0;
	scanf("%d%d",&n,&m);
	for(i=0;i<n;i++)
	{scanf("%d",&a[i]);
	sum+=a[i];}
	sort(a,a+n,cmp);
	if((double)a[m-1]>=sum/(4*m)) printf("Yes");
	else printf("No");
}