#include <bits/stdc++.h>
using namespace std;
int main(int argc, char const *argv[]) {
  int n;
  double sum = 0;
  double a[101];
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> a[i];
    sum = sum + (a[i] / 100);
  }
  double result = (sum / n) * 100;
  cout << result << endl;
  return 0;
}
