#include<iostream>

using namespace std;

int main(){
  int n,temp;
  cin >> n;

  int a[n];
  for(int i=0; i<n; i++){
    cin >> a[i];
  }

  for(int i=0; i<n-1; i++){
    for(int j=i+1; j<n; j++){
      if(a[i] < a[j]){
        temp = a[i];
        a[i] = a[j];
        a[j] = temp;
      }
    }
  }

  double median;
  if(n%2 == 0){
    median = (a[n/2-1] + a[n/2])/2.0;
  }else{
    median = a[n/2];
  }

  cout << median << endl;

  return 0;

}