You are given a math word problem and you are supposed to apply multiple mathematical operators like addition, subtraction, multiplication, or division on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Example Input: a waiter had 47 customers to wait on . if 41 customers left and he got another 20 customers how many customers would he have ?
Example Output: 26

Example Input: alexa is reading a nancy drew mystery . there are 95 pages in her book . she read 18 pages the first day . the next day alexa just could n't stop reading . she read 58 pages . how many pages does alexa have left to read ?
Example Output: 19

Example Input: there were 86 trees in a park . 15 of them died and another 23 of them were cut . how many trees were still left ?
Example Output:
48