#include <bits/stdc++.h>
int main() {
  int n;
  double tab[100];
  double s = 0;
  std::cin >> n;
  for (int i = 0; i < n; i++) {
    std::cin >> tab[i];
    s = s + (tab[i] / 100);
  }
  std::cout << (s / n) * 100;
  return 0;
}
