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