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]: 29 birds were sitting in a tree . Some more fly up to the tree . Then there were 42 birds in the tree . How many more flew up to the tree ?
[EX A]: 13

[EX Q]: Joan had 5 dimes in her bank . She spent 2 of her dimes . How many dimes does she have now ?
[EX A]: 3

[EX Q]: There are 34 dogwood trees currently in the park . Park workers will plant 49 more dogwood trees today . How many dogwood trees will the park have when the workers are finished ?
[EX A]:
83