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:
Sam found 18 seashells and Mary found 47 seashells on the beach.How many seashells did they find together?

Ex Output:
65.0


Ex Input:
Fred has 5 baseball cards. Melanie bought 3 of Fred's baseball cards.How many baseball cards does Fred have now?

Ex Output:
2.0


Ex Input:
Sam found 35 seashells on the beach, he gave Joan 18 of theseashells. How many seashells does he now have?

Ex Output:

17.0