Based on the given tweet, determine the level of sadness the author is experiencing. Choose from the following options: 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.
Tweet: Finished writing my second book tonight. #somber #sad #youpromised #havemercy #author #writer #needpublisher #beingedited #workingonsidebook
1: low amount of sadness can be inferred