Based on the tweet "There is no melancholy in fools - that's why they make us laugh.  #aphorism #melancholy", categorize the level of sadness felt by the author. Select from the following: 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.