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: Fred has 5 yellow balloons , Sam has 6 yellow balloons , and Mary has 7 yellow balloons . The balloons cost 5 dollars . How many yellow balloons do they have in total ?
Example Output: 18

Example Input: Sara grew 4 onions , Sally grew 5 onions , and Fred grew 9 onions . How many onions did they grow in all ?
Example Output: 18

Example Input: Gwen was organizing her book case making sure each of the shelves had exactly 9 books on it . If she had 3 shelves of mystery books and 5 shelves of picture books , how many books did she have total ?
Example Output:
72