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

Example Input: A box of books weighs 42 pounds . Each book weighs 3 pounds . How many books are there in the box ?
Example Output: 14

Example Input: Adolfo made a tower with 35 blocks . He added some more blocks and now he has 65 blocks . How many did he have to add ?
Example Output: 30

Example Input: There are 6 marbles in each box . How many marbles are in 3 boxes ?
Example Output:
18