title: Write program which count sum of numbers divided by 4
body: <p>I need to write a program which count sum of numbers divided by 4. I'm really beginner in C#. 
  Could you lead me to solve this problem? </p>
  
  <p>I write something like this but I don't know what next and there is one problem because I put only two numbers but numbers could be a lot of. </p>
  
  <pre><code>Console.WriteLine("number a");
  int a = int.Parse(Console.ReadLine());
  Console.WriteLine("number b");
  int b = int.Parse(Console.ReadLine());
  int sum = a + b;
  </code></pre>