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:
Jason has 18 books and he has read 9 of them. Mary has 42 books.How many books do they have together?

Ex Output:
60.0


Ex Input:
A petri dish originally contained 600 bacteria. A scientist let thebacteria grow and now there are 8917 of them. How many morebacteria are there now?

Ex Output:
8317.0


Ex Input:
Mary is baking a cake. The recipe calls for 7 cups of flour and 3 cupsof sugar. She already put in 2 cups of flour. How many cups of flourdoes she need to add?

Ex Output:

5.0