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: A new building needed 11 windows . The builder had already installed 4 of them . If it takes 8 hours to install each window , how long will it take him to install the rest ?

Output: 56

Input: Consider Input: A toy store had 6 giant stuffed bears in stock when they got another shipment with 18 bears in it . The put the bears onto shelves with 6 on each shelf . How many shelves did they use ?

Output: 4

Input: Consider Input: A waiter had 19 customers to wait on . If 14 customers left and he got another 36 customers , how many customers would he have ?
Output: 41