<|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 [1, 10, 100, 1000], find an arithmetic equation that equals 100. You are allowed to use the basic arithmetic operations (+, -, *, /) and each number can only be used once. Show your work in <think> </think> tags. Finally, return the equation and answer in <answer> </answer> tags, for example <answer> (1 + 10) * 10 + 100 = 100 </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>