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: Nell collects baseball cards . She had 304 cards . She gave some of her cards to Jeff and now has 276 cards left . How many cards did Nell give to Jeff ?
Example Output: 28

Example Input: Melanie picked 7 plums and 4 oranges from the orchard . She gave 3 plums to Sam . How many plums does she have now ?
Example Output: 4

Example Input: For Halloween Robin scored 23 pieces of candy . She ate 7 pieces the first night and then her sister gave her 21 more pieces . How many pieces of candy does Robin have now ?
Example Output:
37