<|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
Using the numbers [5, 15, 42, 2], find a way to get to 85. You can use +, -, *, / and each number only once. Show your work in <think> </think> tags.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>