You know how to install Drupal the normal way, but there is a shortcut, if you have drush.
Drush provides a command (site-install) for downloading modules. Drupal, itself, is kept as a project in the modules section of Drupal. So, drush can download it, as well. Installing Drupal can be done with another drush command. Here is how to install Drupal, in 3 easy steps: