Based on the tweet "Full of #optimism after the FP Summit yesterday. Thanks to @melindagates @FP2020Global @UNFPA and @DFID_UK we're thinking about #HerFuture", 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.