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 33 oak trees currently in the park. Park workers had to cutdown 18 oak trees that were damaged. How many oak trees will bein the park when the workers are finished?

Ex Output:
15.0


Ex Input:
Recently, the value of Kate's retirement fund decreased by $12. Ifher fund was worth $1472 before, how much is it worth now?

Ex Output:
1460.0


Ex Input:
Roadster's Paving Company used 10 tons of cement to pave Lexi'sstreet and 5.1 tons of cement to pave Tess's street. How muchcement did Roadster's Paving Company use in all?

Ex Output:

15.1