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:
Amy had 26 music files and 36 video files on her flash drive . If she deleted 48 of the files , how many files were still on her flash drive ?

Ex Output:
14


Ex Input:
Mary had 7 nickels in her bank . Her dad gave her 5 nickels . How many nickels does Mary have now ?

Ex Output:
12


Ex Input:
A furniture store marks up items 20 % . It the furniture store buys a couch for 350 dollars , what will the selling price be , in dollars ?

Ex Output:

420