Teacher: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.
Teacher: Now, understand the problem? Solve this instance: Context: Paul got a box of some crayons for his birthday. By the end of the school year he only had 291 crayons left since he had either lost or given away 315 of them.

Question: How many crayons did he get for his birthday?
Student:
606