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 Q]: There are 5 oak trees currently in the park . Park workers will plant 4 more oak trees today . How many oak trees will the park have when the workers are finished ?
[EX A]: 9

[EX Q]: Mark has 13 trees in his backyard . If he plants 12 more , how many trees will he have ?
[EX A]: 25

[EX Q]: While shopping for music online , Isabel bought 4 country albums and 5 pop albums . Each album came with a lyric sheet and had 8 songs . How many songs did Isabel buy total ?
[EX A]:
72