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:
Zach scored 42 points in the football game . Ben scored 21 points . How many more points did Zach score ?

Ex Output:
21


Ex Input:
While playing a video game , Paul scored 3103 points . He and his cousin together have a total of 5816 points . How many points does Paul 's cousin have ?

Ex Output:
2713


Ex Input:
At the arcade , Jerry won 29 tickets playing ' whack a mole ' and 17 tickets playing ' skee ball ' . If he spent 12 of his tickets on a hat , how many tickets does Jerry have left ?

Ex Output:

34