#include <bits/stdc++.h>
using namespace std;
const int maxn = 1e5 + 5;
const int mod = 1e9 + 7;
const int inf = 1e9;
const int del = 728729;
int arr[maxn];
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  ;
  int n;
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> arr[i];
  }
  sort(arr, arr + n);
  for (int i = 1; i < n; i++) {
    arr[i] = arr[i - 1] + arr[i];
    arr[i] /= 2;
  }
  cout << arr[n - 1];
  return 0;
}
