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 teacher had 7 worksheets to grade . If she graded 2 , but then another 46 were turned in , how many worksheets would she have to grade ?
Example Output: 51

Example Input: A book store had 41 books in the bargin bin . If they sold 33 books , but then put 2 more in the bin , how many books would be in the bin ?
Example Output: 10

Example Input: In a video game , each enemy defeated gives you 7 points . If a level has 11 enemies total and you destroy all but 8 of them , how many points would you earn ?
Example Output:
21