Given a math word problem, answer the following question. You might need to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the question and then only report the final numerical answer.

Ex Input:
jovana filled her bucket with 5 pounds of shells . if a friend comes to add 15 pounds of shells and another friend comes to add 17 pounds of shells how many pounds does she have altogether ?

Ex Output:
37

Ex Input:
sean is playing monopoly with his friends . he already has 27 houses . sean traded in 8 houses for money to buy park place . he collected so much rent that he decided to buy 12 more houses . how many houses did sean have then ?

Ex Output:
31

Ex Input:
maria had 50 sheets of paper in her desk and 41 more in her backpack . how many did she have total ?

Ex Output:
91