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:
For homework Nancy had 17 math problems and 15 spelling problems . If she can finish 8 problems in an hour how long will it take her to finish all the problems ?

Ex Output:
4

Ex Input:
Vanessa had 13 music files and 30 video files on her flash drive . If she deleted 10 of the files , how many files were still on her flash drive ?

Ex Output:
33

Ex Input:
A pet shelter had 3 puppies when another 3 were brought in . If 3 puppies a day are adopted , how long would it take for all of them to be adopted ?

Ex Output:
2