You are given a math word problem and you are supposed to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Example Input: Gwen was organizing her book case making sure each of the shelves had exactly 4 books on it . If she had 5 shelves of mystery books and 3 shelves of picture books , how many books did she have total ?
Example Output: 32

Example Input: Fred loves trading cards . He bought 2 packs of football cards for $ 2.73 each , a pack of Pokemon cards for $ 4.01 , and a deck of baseball cards for $ 8.95 . How much did Fred spend on cards ?
Example Output: 18.42

Example Input: Robin had 30 songs on her mp3 player . If she deleted 8 old songs from it and then added 10 new songs , how many songs does she have on her mp3 player ?
Example Output:
32