#include<bits/stdc++.h>
using namespace std;
int a[101];
bool cmp(int x,int y)
{
	return x>y; 
}
int main()
{
	int n,m;cin>>n>>m;
	int s=0;
	for(int i=1;i<=n;s+=a[i++])
		cin>>a[i];
	sort(a+1,a+n+1,cmp);
	if(a[m]<s/4.0/m)cout<<"No";
	else		  cout<<"Yes";
}