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.

Input: Consider Input: Michelle began her pizza delivery route with 0.5 tank of gas in her car . When she made it back to the pizzeria , 0.16666666666666666 tank of gas was . How much gas did Michelle use ?

Output: 0.3333333333333333

Input: Consider Input: Mrs. Hilt baked pies last weekend for a holiday dinner . She baked 16 pecan pies and 14 apples pies . If she wants to arrange all of the pies in rows of 5 pies each , how many rows will she have ?

Output: 6

Input: Consider Input: Before December , customers buy 1346 ear muffs from the mall . During December , they buy 6444 more , and there are none left . In all , how many ear muffs do the customers buy ?
Output: 7790