using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("how many marks");

        int nummarks = Convert.ToInt16(Console.ReadLine()); 

        int sum =0;

        for (int x=0; x<nummarks; x++)

        {

            Console.WriteLine("Mark: " + x);

            sum = sum + Convert.ToInt32(Console.ReadLine());

        }

        double avg=sum/nummarks;

        Console.WriteLine("The average is " + avg);

    }

}