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

int main() {
	int n,m,i,j,k,ans,cur;
	cin >> n >> m;
	vector<int> a(n);
	cur=0;
	for(i=0; i<n; i++){
		cin >> a[i];
		cur+=a[i];
	}
	sort(a.begin(),a.end());
	if(a[n-m]*4*m<cur){
		cout << "No" << endl;
	}else{
		cout << "Yes" <<endl;
	}
	return 0;
}