Given a math word problem, answer the following question. You might need to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the question and then only report the final numerical answer.

Ex Input:
a company was offering a special on cell phones for $ 2 each . but only if you spent 7 dollars a month for 4 months . how much would it end up costing you total if you bought 1 phone ?

Ex Output:
30

Ex Input:
frank had 13 boxes . if he filled 8 with toys how many boxes does he still have ?

Ex Output:
5

Ex Input:
evan has a large collection of books . he gave his best friend 14 books . he gave his little brother 8 books . now evan has 60 books in his collection . how many books did he have at first ?

Ex Output:
82