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: a chef had 14 apples . if he used 8 of them to make a pie how many apples would he still have ?
Example Output: 6

Example Input: there are 96 trees in a park . 15 of them are huge ancient oaks and another 23 of them are medium-sized fir trees . the rest are saplings . how many saplings are in the park ?
Example Output: 58

Example Input: the following week they decided to go to lake huron and lake michigan . during their stay there they caught a total of 30 pikes 40 sturgeons and 75 herrings . how many fishes did they catch from the 2 lakes ?
Example Output:
145