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