#include<bits/stdc++.h>
using namespace std;
int n,a[1001],m,s;
int main()
{
	cin>>n>>m;
	for(int i=1;i<=n;i++)cin>>a[i],s+=a[i];
	sort(a+1,a+n+1);
		if((double)a[n-m+1]<(double)s/4.0/m)cout<<"No",exit(0);
	cout<<"Yes";
}