You are given a math word problem and you are supposed to apply an addition mathematical operator on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Example input: Context: 21 children were riding on the bus. At the bus stop 5 children got off the bus while some more got on the bus. Then there were 16 children altogether on the bus. 

 Question: How many children got on the bus at the bus stop?
Example output: 0
Example explanation: Number of children who got on -> 21 - 5 + x = 16 , x = 0, hence no one got onto the bus
Q: Context: Rachel picked 7 apples from her tree. Thereafter 2 new apples grew on the tree. Now the tree has 6 apples still on it. 

 Question: How many apples did the tree have to begin with?
A:
11