#include<bits/stdc++.h>
using namespace std;
#define N 105

int n,m,arr[N],sum=0;
float c;

int main()
{
	cin>>n>>m;
	for(int i=0;i<n;i++)
	{
		cin>>arr[i];
		sum+=arr[i];
	}
	sort(arr,arr+n);
	c=(float)sum/(4*m);
	if(arr[n-m]>=c)
		cout<<"Yes";
	else
		cout<<"No";
}
