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:
For Halloween Emily received 5 pieces of candy from neighbors and 13 pieces from her older sister . If she only ate 9 pieces a day , how long would the candy last her ?

Ex Output:
2


Ex Input:
Oliver was organizing his baseball cards in a binder with 3 on each page . If he had 2 new cards and 10 old cards to put in the binder , how many pages would he use ?

Ex Output:
4


Ex Input:
John walks 0.7 miles to school and Nina walks 0.4 miles to school . How much farther does John walk than Nina ?

Ex Output:

0.3