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:
Mike has 35 books in his library. He bought several books at a yardsale over the weekend. He now has 56 books in his library. Howmany books did he buy at the yard sale?

Ex Output:
21.0


Ex Input:
A construction company ordered 0.16 ton ofconcrete, 0.14 ton of bricks, and 0.5 ton of stone. How many tons of material did the company order in all?

Ex Output:
0.8


Ex Input:
Alyssa's dog had puppies. She gave 7 to her friends. She now has 5puppies. How many puppies did she have to start with?

Ex Output:

12.0