#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <algorithm>
using namespace std;
#define REP(i,n) for(int i = 0; i < (n); i++)

int main(){


  int n,m; cin >> n;
  vector<int> v(n);
  REP(i,n) {
    cin >> v[i];
  }
  sort(v.begin(),v.end());
  float ans = 0;
  if (n % 2 == 0) {
    m = n / 2;
    ans = (double)(v[m-1] + v[m]) / 2;
  }else{
    m = n / 2 + 1;
    ans = v[m-1];
  }
  cout << ans << "\n";

  return 0;
}