using System;

public class Program

{

    static double Average()

    {

        Console.WriteLine("Entr in first Mark: ");

        int iMark1 = int.Parse(Console.ReadLine());

        Console.WriteLine("Entr in second Mark: ");

        int iMark2 = int.Parse(Console.ReadLine());

        return ((iMark1 + iMark2)/2.0);

    }

    public static void Main()

    {

        Console.WriteLine("Your average is: "+ Average().ToString(".00"));

    }

}