Instructions: 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.
Input: Context: Rachel has 52 apple trees. She picked 2 apples from 1 of her trees. Now the tree has 7 apples still on it. 

 Question: How many apples did the tree have to begin with?
Output:
9