#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  scanf("%d", &n);
  vector<int> v(n);
  for (int i = 0; i < n; i++) scanf("%d", &v[i]);
  sort(v.begin(), v.end());
  int ans = v[0];
  for (int i = 1; i < n; i++) {
    ans = (ans + v[i]) / 2;
  }
  printf("%d\n", ans);
}
