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.

Example Input: On her vacation last summer, Trisha walked all over New York City to buy souvenirs. First, she walked 0.12 mile from her hotel to a postcard shop. Then she walked 0.15 milefrom the postcard shop to a T-shirt shop and 0.63 mile from the T-shirt shop back to the hotel. How many miles didTrisha walk in all?
Example Output: 0.9

Example Input: Jason has 3 Pokemon cards. Benny bought 2 of Jason's Pokemoncards. How many Pokemon cards does Jason have now?
Example Output: 1.0

Example Input: Mary found 18 seashells and Jessica found 41 seashells on the beach.How many seashells did they find together?
Example Output:
59.0