Given the emotion sadness and the tweet "#depressed Today was bitter sweet watching all the kids go back to school made me really miss my babies. I'm so broke #backtoschool2017", classify the intensity of the emotion displayed in the tweet. The classification options are: 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.