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.

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:
If 0.6667 of a pound is worth 8 dollars , how much is 0.75 pounds worth ?

Ex Output:
9


Ex Input:
Tony had $ 20 . Tony paid $ 8 for a ticket to a baseball game . At the game , Tony bought a hot dog for $ 3 . What amount of money did Tony have then ?

Ex Output:

9