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.

Ex Input:
The school cafeteria ordered 42 red apples and 7 green apples for students lunches . But , if only 9 students wanted fruit , how many extra did the cafeteria end up with ?

Ex Output:
40

Ex Input:
At the fair there were 9 people in line for the bumper cars . If 6 of them got tired of waiting and left and 3 more got in line , how many people would be in line ?

Ex Output:
6

Ex Input:
So far , an orchard has sold a combined total of 9792 pounds of fresh and frozen fruit this season . If they have sold 3513 pounds of frozen fruit , how many pounds of fresh fruit have been sold so far ?

Ex Output:
6279