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