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.

Example Input: A magician was selling magic card decks for 5 dollars each . If he started with 14 decks and by the end of the day he had 5 left , how much money did he earn ?
Example Output: 45

Example Input: For Halloween Janet and her sister combined the candy they received . Janet had 34 pieces of candy while her sister had 33 . If they ate 4 pieces the first night , how many pieces do they have left ?
Example Output: 63

Example Input: A waiter at ' The Greasy Spoon ' restaurant had 39 customers to wait on . During the lunch rush he added another 12 customers . If 49 of the customers did n't leave him a tip , how many customers did leave a tip ?
Example Output:
2