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:
Heather weighs 87 pounds . Emily weighs 9 pounds . Elizabeth weighs 8 pounds . How much heavier is Heather than Emily ?

Ex Output:
78


Ex Input:
Tommy had some balloons . His mom gave him 34 more balloons for his birthday . Then , Tommy had 60 balloons . How many balloons did Tommy have to start with ?

Ex Output:
26


Ex Input:
Blake filled a bucket with 0.8 gallon of water . Later , he poured out 0.2 gallon of the water . How much water is in the bucket ?

Ex Output:

0.6