#include<iostream>
#include<algorithm>
using namespace std;
int main()
{
	int N,M,sum;
	cin>>N>>M;
	int *a=new int[N];
	int i;
	sum=0;
	for(i=0;i<N;i++)		
	{
		cin>>a[i];
		sum+=a[i];	
	}
	sort(a,a+N);
	if(a[N-M]*4*M>=sum)
	{
		cout<<"Yes"<<endl;
		return 0;
	}
	else cout<<"No"<<endl;
	return 0;
 } 