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