You are provided with an arithmetic question. Your task is to compute the solution using the given arithmetic operations. The only arithmetic operators needed to answer the questions are'+'(addition) and'-'(subtraction). The answer should be correct to one decimal place.

Ex Input:
There are 3 short trees and 6 tall trees currently in the park. Parkworkers will plant 9 short trees today. How many short trees will thepark have when the workers are finished?

Ex Output:
12.0


Ex Input:
There are 53 maple trees currently in the park. Park workers willplant maple trees today. When the workers are finished there will be64 maple trees in the park. How many maple trees did the workersplant today?

Ex Output:
11.0


Ex Input:
Wendy ran 19.8 miles and walked 9.2 miles. How much farther did Wendy run thanwalk?

Ex Output:

10.6