using System;

namespace yukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            int a = int.Parse(Console.ReadLine());
            string[] str = Console.ReadLine().Split(' ');
            double[] str1 = new double[str.Length];
            double b;
            int c;
            double num=0;
            for (int i = 0; i < str.Length; i++)
            {
                str1[i] = int.Parse(str[i]);
            }

            for (int x = 0; x <= str1.Length; x++)
            {
                for (int y = x; y < str1.Length; y++)
                {
                    if (str1[y] < str1[x])
                    {
                        b = str1[x];
                        str1[x] = str1[y];
                        str1[y] = b;
                    }
                }
            }
            if (a % 2 == 0)
            {
                c = a / 2;
                num = (str1[c] + str1[c -1]) / 2;
            }
            else
            {
                c = a / 2;
                num = str1[c] ;
            }
            Console.WriteLine(num.ToString());
        }
    }
}