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.

Ex Input:
a worksheet had 4 problems on it . if a teacher had 9 worksheets to grade and had already graded 5 of them how many more problems does she have to grade ?

Ex Output:
16


Ex Input:
a magician was selling magic card decks for 2 dollars each . if he started with 5 decks and by the end of the day he had 3 left how much money did he earn ?

Ex Output:
4


Ex Input:
janice has 316 bottle caps that must be put away in boxes . douglas comes to help and brings 17 cookies to share with janice . if there are 79 boxes how many bottle caps must go in each box ?

Ex Output:

4