Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

Example Input: I bought this from the same co. before christmas and was stunned that the price had doubled. On the page the price was not clear!
Example Output: Negative

Example Input: This machine does a decent job of cleaning when it works, but it breaks way to easily for the price, and its not built well enough to justify fixing. Too many cheap plastic parts. Consider it to be disposable if you buy it.
Example Output: Negative

Example Input: Very good air mattress, have had many friends come and stay on it and it hasn't lost much air. Would recommend it if you need an air mattress for visitors.
Example Output:
Positive