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: Cade had 87 marbles . He gave 8 to Dylan . How many does he have left ?
Example Output: 79

Example Input: Vanessa had 13 music files and 30 video files on her flash drive . If she deleted 10 of the files , how many files were still on her flash drive ?
Example Output: 33

Example Input: Your class had a pizza party . 0.375 of a pizza was left over , and 0.5 of another pizza was left over . You put them both into one box . How much pizza do you have altogether ?
Example Output:
0.875