#include <bits/stdc++.h>
int a[105], s, n, m;
int main() {
	std::cin >> n >> m;
	for (int i = 1; i <= n; ++i) std::cin >> a[i], s += a[i];
	std::sort(a + 1, a + n + 1), std::reverse(a + 1, a + n + 1);
	if (a[m] * 4 * m < s) puts("No");
	else puts("Yes");
}
