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