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

Ex Input:
Chloe was organizing her book case making sure each of the shelves had exactly 6 books on it . If she had 5 shelves of mystery books and 4 shelves of picture books , how many books did she have total ?

Ex Output:
54


Ex Input:
A car company produced 3884 cars in North America and 2871 cars in Europe . How many cars is that in all ?

Ex Output:
6755


Ex Input:
Tim had 7 quarters and 9 nickels in his bank . His dad gave him 3 nickels and 5 pennies . How many nickels does Tim have now ?

Ex Output:

12