#include <bits/stdc++.h>
using namespace std;
#define REP(i,N) for(i=0;i<N;i++)
typedef long long ll;
typedef pair<int, int> P;
typedef struct{
  int first;
  int second;
  int third;
}T;

//昇順
bool comp_Se(T& l, T& r){
  return l.second < r.second;
}

int main(void){
  int N;
  cin >> N;
  int i;
  vector<int> A(N);
  REP(i,N) cin >> A[i];
  sort(A.begin(),A.end());
  if(N%2) cout << A[N/2] << endl;
  else cout << (float)(A[N/2] + A[N/2-1])/2 << endl;
  return 0;
}