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.

Example Input: their last stop before leaving the zoo is the bird museum . there they went through 7 bird exhibits spending 9 minutes going around each exhibit . how much time did they spend going through the museum ?
Example Output: 63

Example Input: laura has 28 blocks and 8 cards . if she shares the blocks among 4 friends how many blocks does each friend get ?
Example Output: 7

Example Input: sam invited 9 friends to a birthday party but 6 could n't come . if he wanted to buy enough cupcakes so each person could have exactly 2 how many should he buy ?
Example Output:
6