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