title: Sum of the first elem of a 3-tuples list
body: <p>I'm new around programming stuff :/</p>
  
  <p>I need to make a function that retrieve the sum of the first element from a 3-tuple list.</p>
  
  <p>I have something like:</p>
  
  <pre><code>tuples = [(11,"11","11"),(22,"22","22"),(33,"33","33"),(44,"44","44"),(55,"55","55"),(66,"66","66")]
  </code></pre>
  
  <p>And I need the sum of the first element of each 3-tuple from the list. = 11+22+33+44+55</p>
  
  <p>Pattern matching maybe? map?</p>