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:
Greg and Sharon own neighboring cornfields . Greg harvested 0.4 acre of corn on Monday and Sharon harvested 0.1 acre . How many more acres did Greg harvest than Sharon ?

Ex Output:
0.3


Ex Input:
At the fair there were 9 people in line for the bumper cars . If 6 of them got tired of waiting and left and 3 more got in line , how many people would be in line ?

Ex Output:
6


Ex Input:
Sara had 21 quarters in her bank . Her dad gave her 49 more quarters . How many quarters does she have now ?

Ex Output:

70