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:
A magician was selling magic card decks for 2 dollars each . If he started with 5 decks and by the end of the day he had 3 left , how much money did he earn ?

Ex Output:
4


Ex Input:
A new building needed 12 windows . The builder had already installed 6 of them . If it takes 4 hours to install each window , how long will it take him to install the rest ?

Ex Output:
24


Ex Input:
A furniture store marks up items 20 % . It the furniture store buys a couch for 350 dollars , what will the selling price be , in dollars ?

Ex Output:

420