#include <bits/stdc++.h>
using namespace std;
int main() {
  unsigned long long int t = 0;
  float z = 0;
  cin >> t;
  float arr[t];
  for (int x = 0; x < t; x++) arr[x] = 0;
  for (int x = 0; x < t; x++) cin >> arr[x];
  for (int x = 0; x < t; x++) z += (arr[x] / 100);
  cout << (z / (t)) * 100 << endl;
}
