#include<iostream>
using namespace std;

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

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

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

  int  c1, c2;
  double median;
  for(i=0;i<n-1;i++){
    if(n%2 == 0){
      //EVEN
      c1 = a[ n/2 - 1 ];
      c2 = a[ n/2 ];
      median = (double)(c1 + c2) / 2;
    }else{
      //ODD
      median = a[ n/2 ];
    }
  }

  cout << median << endl;
  
  return 0;
}