diff --git a/gradebook/src/GradeBook/Program.cs b/gradebook/src/GradeBook/Program.cs
index a4a009d..f4b443d 100644
--- a/gradebook/src/GradeBook/Program.cs
+++ b/gradebook/src/GradeBook/Program.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 
 namespace GradeBook
 {
@@ -6,15 +7,17 @@ namespace GradeBook
     {
         static void Main(string[] args)
         {
-            var numbers = new[] {12.7, 10.3, 1.1};
+            List<double> grades = new List<double>() {12.7, 10.3, 6.11, 4.1};
+            grades.Add(56.1);
             double result = 0;
 
-            foreach (var number in numbers)
+            foreach (var number in grades)
             {
                 result += number;
             }
+            result /= grades.Count;
 
-            System.Console.WriteLine(result);
+            System.Console.WriteLine($"The average grade is {result}");
 
             if (args.Length > 0)
             {