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

int N, M, A[1010], total=0;

int main () {
	cin >> N >> M;
	for(int i=1; i<=N; i++) {
		cin >> A[i];
		total += A[i];
	}
	sort(A+1, A+N+1, greater<int>());
	if (A[M]*4*M >= total) {
		cout << "Yes" << endl;
	} else {
		cout << "No" << endl;
	}
}
