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

Example Input: Dan has 32 green and 38 violet marbles . Mike took 23 of Dan 's green marbles . How many green marbles does Dan now have ?
Example Output: 9

Example Input: Lewis saved checking on the grapevines for his last stop . He was told by one of the pickers that they fill 324 drums of grapes per day . How many drums of grapes would be filled in 9 days ?
Example Output: 2916

Example Input: Adam has $ 5 to buy an airplane that costs $ 4.28 . How much change will Adam get ?
Example Output:
0.72