using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    public void Solve()
    {
        int N = int.Parse(Console.ReadLine());
        int[] A = Console.ReadLine().Split(' ').Select(s => int.Parse(s)).ToArray();

        Array.Sort(A);

        int mid = A.Length / 2;

        if (0 < A.Length % 2)
        {
            Console.WriteLine(A[(int)mid]);
        }
        else
        {
            Console.WriteLine((float)(A[(int)mid - 1] + A[(int)mid]) / 2);
        }
    }

    static void Main()
    {
        var solver = new Program();
        solver.Solve();
    }
}