using System;
using System.Linq;

namespace No275
{
    class Program
    {
        static void Main(string[] args)
        {
            var N = int.Parse(Console.ReadLine());
            var As = Console.ReadLine().Split(' ').Select(a => int.Parse(a)).ToArray();

            var ordered = As.OrderBy(a => a).ToArray();
            var result = N % 2 == 0
                ? new[] { ordered[N / 2 - 1], ordered[N / 2] }.Average()
                : ordered[N / 2];

            Console.Write(result);
        }
    }
}