#include<iostream>
using namespace std;
int main()
{
	int n,i,m,a[100],count=0;
	double s=0;
	cin>>n>>m;
	for(i=0;i<n;i++)
	{
		cin>>a[i];
		s+=a[i];
	}
	s=s/4.0/m;
	for(i=0;i<n;i++)
	{
		if(a[i]>=s)
		count++;
	}
	if(count>=m)
	cout<<"Yes";
	else
	cout<<"No";
}