#include <bits/stdc++.h>
using namespace std;
int main() {
  double n;
  cin >> n;
  double sum = 0;
  double temp;
  for (int i = 0; i < n; i++) {
    cin >> temp;
    sum += temp;
  }
  double fraction;
  fraction = sum / (n * 100);
  fraction = fraction * 100;
  cout << fraction << endl;
  return 0;
}
