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:
For homework Amy had 18 math problems and 6 spelling problems . If she can finish 4 problems in an hour how long will it take her to finish all the problems ?

Ex Output:
6


Ex Input:
There was a stack of 700 sheets of used paper . Lexie wants to place it in boxes for recycling . If every box can contain 100 sheets , how many boxes does Lexie need ?

Ex Output:
7


Ex Input:
A store had 40 coloring books in stock . They ended up putting them on sale and getting rid of 20 of them . The put the ones they still had onto shelves with 4 on each shelf . How many shelves did they use ?

Ex Output:

5