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. 

Example Input: This variety pack is perfect for when you want something crunchy and salty. The selection of flavors were great choices for me - I liked them all. The portion keeps you from overeating, and they are healthier for you than potato chips, even the baked ones. I recommend these and will be buying them again and again.
Example Output: 5

Example Input: I loved this tea! It is refreshing and delicious with or without sweetener. A great buy! I would definitely recommend this product!
Example Output: 5

Example Input: This product contains partially hydrogenated oils which is very detrimental to your health. I would rather pay more for a product which does not contain transfats.
Example Output:
3