How to make the cart menu display the number of items added? How to make the cart menu display the number of items added?

Example If I added one item, the cart menu will display "one".

Module: Drupal Commerce
Commerce Ajax Add to Cart


  Using this module you can ajaxify the add to cart operation. The
  updated cart will be displayed without page refresh and a popup
  message will be shown after you add an item to cart. You can customize
  the look of the blocks using its template files.