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:
2 birds were sitting on the fence . 4 more birds came to join them . How many birds are sitting on the fence ?

Ex Output:
6


Ex Input:
There are 2 students in the class and 18 pencils . If the pencils are divided equally among the students , how many does each student get ?

Ex Output:
9


Ex Input:
Kaleen filled a bucket with 0.75 gallon of water . A few minutes later , she realized only 0.5 gallon of water remained . How much water had leaked out of the bucket ?

Ex Output:

0.25