using System;

public class Program

{

    public static void Main()

    {   //Question 2 

    }   int a = 4, b = -2, c = 11, d = -4, e = 5, f = 9, g = 7;

    double average = (a + b + c + d + e + f + g) / 7.0; 

    Console.WriteLine(average.ToString("0.00"));

}