Given a math word problem, answer the following question. You might need to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the question and then only report the final numerical answer.
Q: there were 22 bales of hay in the barn . keith stacked more bales in the barn today . there are now 89 bales of hay in the barn . how many bales did he store in the barn ?
A:
67