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:
Ned had 15 video games but 6 of them were n't working . If he wanted to sell the working games for $ 7 each , how much money could he earn ?

Ex Output:
63


Ex Input:
A chef needs to cook 15 potatoes . He has already cooked 6 . If each potato takes 8 minutes to cook , how long will it take him to cook the rest ?

Ex Output:
72


Ex Input:
Mrs. Hilt measured the distance from her desk to the water fountain . It was 30 feet . How many feet will Mrs. Hilt walk on her trips to the fountain if she goes to the water fountain 4 times today ?

Ex Output:

120