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

namespace yukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] numArray = new int[int.Parse(Console.ReadLine())];

            string s = Console.ReadLine();
            string[] t = s.Split(' ');
            
            for(int i = 0; i < t.Length; i++)
            {
                numArray[i] = int.Parse(t[i]);
            }

            Array.Sort(numArray);
            int j = numArray.Length;
            if(j % 2 == 0)
            {
                double tmp = numArray[j / 2];
                tmp = (tmp + numArray[(j / 2) - 1]) / 2;
                Console.WriteLine("{0}", tmp);
            }
            else
            {
                Console.WriteLine(numArray[j / 2]);
            }
            //Console.ReadLine();

        }
    }
}