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

Ex Input:
David has 7 boxes of stuffed toy dogs . Each box has 4 dogs in it . How many dogs are there in all ?

Ex Output:
28


Ex Input:
Each chocolate bar in a box cost $ 4 . If a box had 11 bars total and Vanessa sold all but 7 bars , how much money would she have made ?

Ex Output:
16


Ex Input:
I walk 1 mile every 15 minutes . I walked 3 miles . How many minutes did it take me ?

Ex Output:

45