#include<bits/stdc++.h>
using namespace std;
int sum, n, q;
signed main() {
	cin >> n;
	while (n--) {
		int t;
		cin >> t;
		sum += t;
		if (!t) q++;
	}
	cout << static_cast<int>(ceil(sum * 1.0 / (n - q))) << '\n';
//	system("pause");
	return 0;
}