#include <bits/stdc++.h>
using namespace std;
int main() {
  int N;
  cin >> N;
  vector<double> v(N);
  double ANS;
  ANS = 0;
  for (int i = 0; i < N; i++) {
    cin >> v[i];
  }
  sort(v.begin(), v.end());
  ANS = v[0];
  for (int i = 1; i < N; i++) {
    ANS = ANS / 2 + v[i] / 2;
  }
}
