using System;

public class Program

{

    public static void Main()

    {

        int i,sum=0,median;

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

        int[] B=new int[100];

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

            {

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

            }

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

                {

                    sum+=B[i];

            }

        sum=sum/n;

        Console.WriteLine("mean is {0}",sum);

        if(n%2==0)

        {

          median=((n+1))/2;

            Console.WriteLine("median is {0}",median);

        }

        else

        {

             median=n/2;

            Console.WriteLine("median is {0}",median);

        }

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

        {

            if(B[i]==B[i+1])

                Console.WriteLine(B[i]);

        }

    } 

}