Given a math word problem, answer the following question. You might need to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the 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: ted and fred measured their height . fred 's height is 98 inches . ted is 39 inches tall . what 's the difference between ted 's height and fred 's height ?
Example Output: 59

Example Input: amy has 67 balloons . 29 of them are red and 17 are green . the rest of the balloons are blue . how many blue balloons does amy have ?
Example Output:
21