#include<iostream>
#include<string>

using namespace std;

int main(){

  int n;
  double to;
  cin >> n;
  int a[n];

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

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

    if(n%2==1)
      to = a[(n/2)];
    else
      to = (a[n/2] + a[n/2-1]) / 2;

      cout << to << endl;
}