#include <iostream>
#include <algorithm>
#include <vector>
#include <iterator>

int main(){
  int N;
  std::vector<int> A;
  
  std::cin >> N;
  A.reserve(N);
  std::copy_n(std::istream_iterator<int>(std::cin),N,std::back_inserter(A));

  if(N%2){
    // odd
    auto center = (N>>1) + 1;
    std::nth_element(A.begin(),A.begin()+center-1,A.end());
    std::cout << A[center-1] << std::endl;
  }else{
    // even
    auto center_min = (N>>1);
    std::nth_element(A.begin(),A.begin()+center_min-1,A.end());
    std::cout << (A[center_min-1] + (* std::min_element(A.begin()+center_min,A.end())))/2.0 << std::endl;
  }
  return 0;
}