Given the task definition and input, reply with output. You are given a math word problem and you are supposed to apply a single mathematical operator like addition, subtraction, multiplication, or division on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

at the bird zoo the kids were able to visit 5 different bird cages each containing 8 different kinds of birds . how many different kinds of birds did the children see from the bird cages ?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
40