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: At Billy 's Restaurant a group with 2 adults and 5 children came in to eat . If each meal cost 3 dollars , how much was the bill ?
Example Output: 21

Example Input: Mary had 7 nickels in her bank . Her dad gave her 5 more nickels . How many nickels does Mary have now ?
Example Output: 12

Example Input: A toy store had 4 giant stuffed bears in stock when they got another shipment with 10 bears in it . The put the bears onto shelves with 7 on each shelf . How many shelves did they use ?
Example Output:
2