Assess the level of sadness present in the following tweet: "Their engine runs on fuel called whining :-)\n\nU jst  hv 2b observant..\nHar din Rona dhona &amp; complain. \nHappy news makes them unhappy :-)". Provide a real number between 0 and 1, with 0 representing the least intensity and 1 representing the highest intensity.
0.479