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