#include <iostream> #include <vector> #include <algorithm>

using namespace std;

int is_max_score(vector<double> score) { double max_score = 0; for (int i = 0; i < score.size(); ++i) { max_score = max(max_score, score[i]); }

return max_score;

}

double change_score(vector<double> score, const double max_score, const int num_sub) {

double average = 0;
for (int i = 0; i < score.size(); ++i) {
	score[i] = (score[i] / max_score) * 100;
	average += score[i];
}
average = average/num_sub;

return average;

}

int main() { cin.tie(nullptr); ios_base::sync_with_stdio(false);

int num_sub;
cin >> num_sub;

vector<double> score(num_sub);
for (int i = 0; i < score.size(); ++i) {
	cin >> score[i];
}

double max_score = is_max_score(score);
cout.precision(15);
cout << change_score(score, max_score, num_sub) << "\\\\n";

return 0;

}

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