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