Determine how strongly joy is expressed in the following tweet. Use the scale: 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.
Tweet: #happiness #recipe: an open mind, #laughter, a kind #heart &amp; #optimism
3: high amount of joy can be inferred