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]: Megan has 19 seashells . How many more seashells does she need to find to have 25 seashells in her collection ?
[EX A]: 6

[EX Q]: For a birthday party Cody bought 4 regular sodas and 44 diet sodas . If his fridge would only hold 6 on each shelf , how many shelves would he fill up ?
[EX A]: 8

[EX Q]: Maria needs 21 cartons of berries to make a berry cobbler . She already has 4 cartons of strawberries and 8 cartons of blueberries . How many more cartons of berries should Maria buy ?
[EX A]:
9