#include <bits/stdc++.h>
#define rep(i, ss, ee) for (int i = ss; i < ee; ++i)
using namespace std;

int main() {
  int N;
  int ans;
  cin >> N;
  vector<int> v(N);
  rep(i, 0, N) { cin >> v[i]; }
  sort(v.begin(), v.end());
  if (v.size() & 1) {
    cout << v[v.size() / 2] << endl;
  } else {
    cout << ((1.0 * (v[v.size() / 2 - 1] + v[v.size() / 2])) / 2) << endl;
  }
  getchar();
}