#include<bits/stdc++.h>
using namespace std;
#define ll long long
int main()
{
	ll n,m;
	cin>>n>>m;
	ll ar[n];
	ll sum=0;
	for(ll i=0;i<n;i++)
	{
		cin>>ar[i];
		sum+=ar[i];
	}
	sort(ar,ar+n,greater<ll>());
	if(4*m*ar[m-1]<sum)
		cout<<"No";
	else
		cout<<"Yes";
}
