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:
Keith loves trading cards . She bought 4 packs of Digimon cards for $ 4.45 each , and a deck of baseball cards for $ 6.06 . How much did Keith spend on cards ?

Ex Output:
23.86


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

Ex Output:
7790


Ex Input:
In fourth grade there were 11 students at the start of the year . During the year 6 students left and 42 new students came to school . How many students were in fourth grade at the end ?

Ex Output:

47