Given the emotion sadness and the tweet "O, the melancholy Catacombs quickly wandered about the Rue Morgue, Madman!", classify the intensity of the emotion displayed in the tweet. The classification options are: 0: no sadness can be inferred, 1: low amount of sadness can be inferred, 2: moderate amount of sadness can be inferred, 3: high amount of sadness can be inferred.