Definition: In this task, you're given a review from Amazon's food products. Your task is to generate a rating for the product on a scale of 1-5 based on the review. The rating means 1: extremely poor, 2: poor, 3: neutral or mixed, 4: good, 5: extremely good. 
Input: NuStevia's White Stevia powder is amazing!  I have been on a low-carb diet for the last year and have lost 27 lbs, and NuStevia products were a big help with the success of my diet.  I love sweet things, and without them I don't think I'd have been able to stay on the low-carb diet.  I have been unable to eat sugar for a long, long while.  I had previously switched to natural sweeteners like honey and agave, but when I discovered they were not on the low-carb diet I'd switched to, I had to find something else to use as a substitute.  NuStevia products are what I chose.  I tried several other types of stevia, but NuStevia products seem to be the best so far.  The bitter aftertaste associated with most stevia products is almost completely absent from NuStevia products. NuStevia white stevia powder is super sweet, so you'll have to use it sparingly, and one bottle lasts a very long time. I'm very happy with the product and will be buying it again and again.
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
4