#include<bits/stdc++.h> //ABC 161_b
using namespace std;
int n,m,a[105],sum,num;
int main(){
	cin>>n>>m;
	for(int i=1;i<=n;i++){
		cin>>a[i];
		sum+=a[i];
	}
	double x=sum/(4.0*m);
	for(int i=1;i<=n;i++){
		if(a[i]>=x)
		num++;
	}
	if(num>=m)
		cout<<"Yes";
	else
		cout<<"No";
	return 0;
}