You are given a math word problem and you are supposed to apply multiple mathematical operators like addition, subtraction, multiplication or division on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Ex Input:
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 Output:
9

Ex Input:
Tony had $ 20 . Tony paid $ 8 for a ticket to a baseball game . At the game , Tony bought a hot dog for $ 3 . What amount of money did Tony have then ?

Ex Output:
9

Ex Input:
There school 's baseball team had 48 new players and 6 returning players . If the coach put them into groups with 6 players in each group , how many groups would there be ?

Ex Output:
9