#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, a;
  float sum = 0, ml = .0100000;
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> a;
    sum = sum + (a * ml);
  }
  cout << (sum / n) * 100;
}
