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:
Pamela bought 9.8 ounces of sugar , and she spilled 5.2 ounces of it on the floor . How much is ?

Ex Output:
4.6

Ex Input:
Jane has 28 old , brown sheets of drawing paper and 27 old , yellow sheets of drawing paper . How many pieces of drawing paper does she have ?

Ex Output:
55

Ex Input:
Keith has 20 books . Jason has 21 books . How many books do they have together ?

Ex Output:
41