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.

Ex Input:
While on vacation , Haley took 50 pictures at the zoo and 8 at the museum . If she later deleted 38 of the pictures , how many pictures from her vacation did she still have ?

Ex Output:
20


Ex Input:
Debby 's class is going on a field trip to the zoo . If each van can hold 9 people and there are 40 students and 14 adults going , how many vans will they need ?

Ex Output:
6


Ex Input:
At lunch a waiter had 7 customers and 4 of them did n't leave a tip . If he got $ 9 each from the ones who did tip , how much money did he earn ?

Ex Output:

27