Compute $i+i^2+i^3+\cdots+i^{258}+i^{259}$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Compute $i+i^2+i^3+\cdots+i^{258}+i^{259}$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
-1
Compute $i+i^2+i^3+\cdots+i^{258}+i^{259}$.
train