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

class Program
{
    static void Main(string[] args)
    {
        var N = int.Parse(Console.ReadLine());
        var input = Console.ReadLine().Split(' ');
        var list = new List<int>();
        foreach (var d in input)
        {
            list.Add(int.Parse(d));
        }
        if (N % 2 == 0) Console.WriteLine(list.Average());
        else Console.WriteLine(list[N/ 2]);
     }
}