You are given a math word problem and you are supposed to apply a single mathematical operators like addition, subtraction, multiplication or division on the numbers embedded in the text to answer the following question and then only report final the 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:
Omar and Karen made egg rolls to share at the school potluck . Omar rolled 219 egg rolls . Karen rolled 229 egg rolls . What is the total number of egg rolls Omar and Karen rolled ?

Ex Output:
448


Ex Input:
Wayne collects 9 blocks . Wayne 's father gives Wayne 6 more . How many blocks does Wayne have ?

Ex Output:

15