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.

Example Input: 18 children were riding on the bus . At the bus stop , some more children got on the bus . Then there were 25 children altogether on the bus . How many children got on the bus at the bus stop ?
Example Output: 7

Example Input: Anthony has 9 pencils . Kathryn gives Anthony 56 more . How many pencils does Anthony have in all ?
Example Output: 65

Example 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 liters of oil . In all , how many liters of oil leaked into the water ?
Example Output:
11687