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:
at billy 's restaurant a group with 2 adults and 5 children came in to eat . if each meal cost 3 dollars how much was the bill ?

Ex Output:
21

Ex Input:
mrs. hilt picked up a book that has 17 pages in it . she read 11 of the pages . how many pages did she have left to read ?

Ex Output:
6

Ex Input:
they also prepared some chips . if he prepared 350 grams of chips and his father prepared 268 grams how much chips should his brother prepare if they are to have 800 grams of chips ?

Ex Output:
182