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:
Joan has 40 blue balloons Melanie has 41 blue balloons . How many blue balloons do they have in total ?

Ex Output:
81

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:
There are 22 walnut trees currently in the park . Park workers will plant walnut trees today . When the workers are finished there will be 55 walnut trees in the park . How many walnut trees did the workers plant today ?

Ex Output:
33