/**
*    author:  ekusiadadus
*    created: 18.08.2021 13:43:33
**/

// #include<bits/stdc++.h>
#include<bits/stdc++.h>

using namespace std;

map < int, int > m;
int msize;

double get_median() {
  int cnt = 0;
  double ans = 0;
  map<int,int>::iterator it = m.begin();
  if (msize % 2 == 0) {
    bool f = true;
    bool s = true;
    for(;it != m.end();){
      cnt += it->second;
      if(f&&(cnt >= (msize/2)))  ans+=it->first, f = false;
      if(s&&(cnt >= (msize/2+1)))  ans+=it->first, s = false;
      advance(it, 1);
    }
    cnt += it->second;
    return ans / 2.0;
  }
  for (;it!=m.end();++it) {
    if (cnt == (msize / 2)) ans = it->first;
    cnt+=it->second;
  }
  return ans;
}

int main() {
  // ifstream in ("input.txt");
  // if (! in ) {
  //   cerr << "Error" << endl;
  //   return 0;
  // }
  // string str;
  // int x;
  // while (getline( in , str)) {
  //   stringstream stream(str);
  //   while (1) {
  //     stream >> x;
  //     if (!stream) break;
  //     m[x]++;
  //   }
  // }
  #ifndef ONLINE_JUDGE
  freopen("input.txt","r",stdin);
  freopen("output.txt","w",stdout);
  #endif
  cin >> msize;
  for(int i = 0; i < msize; ++i){
    int x;
    cin >> x;
    m[x]++;
  }
  cout << fixed << setprecision(1) << get_median() << endl;
  return 0;
}