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 new building needed 14 windows . the builder had already installed 5 of them . if it takes 4 hours to install each window how long will it take him to install the rest ?

Ex Output:
36


Ex Input:
christian 's mother prepared lemonade . every pitcher of lemonade can serve 5 glasses . if she was able to serve 30 glasses of lemonade how many pitchers of lemonade did she prepare ?

Ex Output:
6


Ex Input:
if each bus have 9 rows of seats and each row of seats can accommodate 4 children how many children can each bus accommodate ?

Ex Output:

36