using System;

public class Program {
	public static void Main(string[] args) {
		Console.ReadLine();
		string[] s = Console.ReadLine().Split(' ');
		int[] array = new int[s.Length];
		for (int i = 0; i < array.Length; i++) {
			array[i] = int.Parse(s[i]);
		}
		Array.Sort(array);
		if (array.Length % 2 == 0) {
			float mid = (array[array.Length/2-1]+array[array.Length/2]) / 2f;
			Console.WriteLine(mid);
			
		} else {
			Console.WriteLine(array[array.Length / 2]);
		}
	}
}