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:
Faye and her mom were picking carrots from their garden . Faye picked 23 and her mother picked 5 . If only 12 of the carrots were good , how many bad carrots did they have ?

Ex Output:
16

Ex Input:
While playing at the arcade , Luke won 2 tickets playing ' whack a mole ' and 13 tickets playing ' skee ball ' . If he was trying to buy candy that cost 3 tickets a piece , how many could he buy ?

Ex Output:
5

Ex Input:
Angela has 11 tickets . Annie gives Angela 4 more . How many tickets does Angela have in all ?

Ex Output:
15