using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        int sum = 0;

        int br = 0;

        int n = int.Parse(Console.ReadLine());

        int[] m = new int[n];

        for (int i = 0; i<n; i++)

        {   m[i] = int.Parse(Console.ReadLine());

        sum = sum + m[i];

        br++;

        }

        Console.WriteLine(sum/br);

    }

}