<|im_start|>system
You are a helpful assistant. You first thinks about the reasoning process in the mind and then provides the user with the answer.<|im_end|>
<|im_start|>user
Given numbers [12, 35, 69, 47], find a set of operations that results in the number 65. Use the buttons on the Countdown board (possibly a lambda, factorial etc.). Show your steps with <think> </think> tags and present your solution adhering to the standard expression format. Remember, each number can only be used once. Your solution should be as simple and clever as possible. Provide your answer in the format of <answer> </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>