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:
An oil pipe in the sea broke . Before engineers started to fix the pipe , 6522 liters of oil leaked into the water . While the engineers worked , the pipe leaked 5165 more liters of oil . In all , how many liters of oil leaked into the water ?

Ex Output:
11687


Ex Input:
At Mrs. Hilt 's house , there was 29 inches of snow , and Brecknock Elementary School received 17 inches of snow . How much more snow did Mrs. Hilt 's house have ?

Ex Output:
12


Ex Input:
Donna weighs 69 pounds . Willie weighs 51 pounds . How much heavier is Donna than Willie ?

Ex Output:

18