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