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: For homework Nancy had 17 math problems and 15 spelling problems . If she can finish 8 problems in an hour how long will it take her to finish all the problems ?
Example Output: 4

Example Input: Sara had 21 quarters in her bank . Her dad gave her 49 quarters . How many quarters does she have now ?
Example Output: 70

Example Input: There are 11 rulers and 34 crayons in the drawer . Tim placed 14 rulers in the drawer . How many rulers are now there in all ?
Example Output:
25