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

Input: Consider Input: Mike is at the library helping put away books . There are 82 book to put away total but a librarian takes 10 of them and leaves Mike with the rest . If he can fit 9 books on a shelf , how many shelves will he need ?

Output: 8

Input: Consider Input: A teacher had 6 worksheets to grade . If she graded 4 , but then another 18 were turned in , how many worksheets would she have to grade ?

Output: 20

Input: Consider Input: Bianca had 45 coloring books . If she gave away 6 of them , but then bought 20 more , how many would she have total ?
Output: 59