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

int n, x, m, u = 1;
int a[200000];
bool f = 1;

int main() {
	cin >> n >> x >> m;

	for (int i = 0; i < n; i++) {
		cin >> a[i];
	}
	
	for (int i = n - 1; i >= 0; i--) {
		if (a[i] / u > x) {
			u *= 2;
			m -= i + 1;
		}

		if (m < 0) {
			f = 0;
			break;
		}
	}

	if (f)
		cout << "Yes" << endl;
	else
		cout << "No" << endl;
}