#include <iostream>
using namespace std;
int total_item;
int dry;
int sup_dry;
const int N = 500500;
int wet[N];
bool check(int time) {
	long long dry_already = time * dry;
	int super_time = time;
	for (int i = 1; i <= total_item; i++) {
		if (wet[i] - dry_already > 0) {
			super_time -= wet[i] - dry_already;	
		}
		else {
			continue;
		}
	}
	if (super_time < 0) {
		return false;
	}
	else {
		return true;
	}
}

int ans;
int main() {
	cin >> total_item >> dry >> sup_dry;
	for (int i = 1; i <= total_item; i++) {
		cin >> wet[i];
	}
	double left = 0;
	double right = N;
	while (left <= right) {
		double mid = (left + right) / 2;
		if (check(mid)) {
			ans = mid;
			right = mid - 1;
		}
		else {
			left = mid + 1;
		}
	}
	cout << ans << endl;
	return 0;
}