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

namespace yukicoder
{
	class Programs
	{
		static void Main(string[] args)
		{
			int N = int.Parse(Console.ReadLine());
			var array = Console.ReadLine().Split(' ').Select(c => int.Parse(c)).OrderBy(c => c).ToArray();
			
			int hN = (N / 2) - 1;
			
		
			if(N % 2 == 0)
			{
				Console.WriteLine((double)(array[hN] + array[hN + 1])/2);
			}else
			{
				Console.WriteLine(array[hN + 1]);
			}
		}
		
	}
	
}