using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace prob275
{
    class Program
    {
        static void Main(string[] args)
        {
            int cnt = int.Parse(Console.ReadLine());
            int[] a = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();

            Array.Sort(a);

            if (a.Length % 2 ==0)
            {
                Console.WriteLine((float)(a[a.Length / 2 -1] + a[a.Length / 2 ])/2);
            }
            else
            {
                Console.WriteLine(a[a.Length /2]);
            }

        }
    }
}