#include <bits/stdc++.h>
using namespace std;

int main(int argc, char *argv[]) {
  int N;
  cin >> N;

  int vals[N + 5];

  for (size_t i = 0; i < N; ++i) {
    cin >> vals[i];
  }

  if (N == 2) {
    return (int)((vals[0] + vals[1] / 2);
  }

  std::sort(vals, vals + N);

  if (vals[0] == vals[N - 1]) {
    return vals[0];
  }

  double result = vals[0];
  for (size_t i = 1; i < N; ++i) {
    result = (result + vals[i]) / 2;
  }

  cout << (int)result;

  return 0;
}
