title: C# How I can make a sum wih Console.Readline
body: <p>The idea that I have is:</p>
  
  <ul>
  <li>Set some variables with its numbers like <code>int a=15, b=10, c=1</code> </li>
  <li>Then with the use of <code>Console.Readline</code> be able to do the sum, for example a+a+b wrote on the console must show 40. </li>
  </ul>
  
  <p>I tried <code>Console.WriteLine("sum: {0}",Console.Readline());</code> I could upload a image with the idea if this it's not enought sorry for my english.</p>