#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <cstring>
#include <string>
#include <algorithm>
#include <cmath>
#include <vector>
#include <queue>
#include <stack>
#include <deque>
#include <map>
#include <unordered_map>
#include <set>
#include <unordered_set>

using namespace std;
#define INF 1234567890

int main() {
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	cout << fixed;
	cout.precision(2);
	int n;
	cin >> n;
	vector<double> vc(n);
	for (int i = 0; i < n; i++) {
		cin >> vc[i];
	}
	sort(vc.begin(), vc.end());
	double sum = 0;
	for (int i = 0; i < n; i++) {
		sum += vc[i] / vc[n - 1] * 100;
	}
	
	cout << sum / n;

	
	return 0;
}