#include <iostream>
#include <vector>
#include <cmath>
#include <algorithm>
using namespace std;

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