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.

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

Example Input: Marcus has 210 baseball cards . He has 58 more than Carter . How many baseball cards does Carter have ?
Example Output: 152

Example Input: Mary has 9 yellow marbles Joan has 3 yellow marbles . How many yellow marbles do they have in all ?
Example Output:
12