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: Luke was helping the cafeteria workers pick up lunch trays , but he could only carry 4 trays at a time . If he had to pick up 20 trays from one table and 16 trays from another , how many trips will he make ?
Example Output: 9

Example Input: Wendy was playing a video game and had 43 lives . In a hard part of the game she lost 8 lives . If she got 39 more lives in the next level , how many lives would she have ?
Example Output: 74

Example Input: At the arcade , Tom won 32 tickets playing ' whack a mole ' and 25 tickets playing ' skee ball ' . If he spent 7 of his tickets on a hat , how many tickets does Tom have left ?
Example Output:
50