Based on the tweet "Lyft app is giving you $50 to use free, enter code DUSK #Who doesn't love a great deal!?  #SAVE", categorize the level of joy felt by the author. Select from the following: 0: no joy can be inferred, 1: low amount of joy can be inferred, 2: moderate amount of joy can be inferred, 3: high amount of joy can be inferred.