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: Roger was putting his spare change into piles . He had 3 piles of quarters and 3 piles of dimes . If each pile had 7 coins in it , how many coins did he have total ?
Example Output: 42

Example Input: You have collected 7 crickets . How many more crickets do you need to collect to have 11 crickets ?
Example Output: 4

Example Input: Students at Arcadia schools are participating in a coat drive . 9437 coats have been collected so far . 6922 coats were collected from the high schools , and the rest from the elementary schools . How many coats were collected at the elementary schools ?
Example Output:
2515