Based on the tweet "Fed up of smiling at old people and getting dirty looks in return. Go fuck yourself Mildred you miserable prick", 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.