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.

Example Input: Helen starts with 82 cards . Gary takes 9 away . How many cards does Helen end with ?
Example Output: 73

Example Input: There are 79 pencils in a box . Eric takes 4 pencils . How many are left ?
Example Output: 75

Example Input: A man starts walking for the first week and walks 10 miles . Every week he increases the distance by 2 miles . How many miles does he walk by the 8th week ?
Example Output:
24