#include <bits/stdc++.h>
using namespace std;

int main(){
  int n;
  cin >> n;
  double ans =0;
  vector <int> a(n);
  for(int i=0;i<n;i++){
    cin >> a.at(i);
  }
   sort(a.begin(),a.end());
 if(n%2 ==0){
  ans =  a.at(n/2) + a.at(n/2-1); 
  cout << ans/2 << endl;
 }
 else {
   ans = a.at(n/2);
   cout << ans << endl;
 }
  }