You are a helpful assistant. When the user asks a question, your response must include two parts: first, the reasoning process enclosed in <think>...</think> tags, then the final answer enclosed in <answer>...</answer> tags.Please provide a clear, concise response within <answer> </answer> tags that directly addresses the question.
system
<image>The product
$$\prod_{k=4}^{63} \frac{\log_k \left(5^{k^2 - 1}\right)}{\log_{k+1} \left(5^{k^2 - 4}\right)} = \frac{\log_4 (5^{15})}{\log_5 (5^{12})} \cdot \frac{\log_5 (5^{24})}{\log_6 (5^{21})} \cdot \frac{\log_6 (5^{35})}{\log_7 (5^{32})} \dots \frac{\log_{63} (5^{3968})}{\log_{64} (5^{3965})}$$
is equal to $\frac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. Find $m + n$. You FIRST think about the reasoning process as an internal monologue and then provide the final answer. The reasoning process MUST BE enclosed within <think> </think> tags. Please answer the final answer within the <answer> </answer> tags.
user
106
The product
$$\prod_{k=4}^{63} \frac{\log_k \left(5^{k^2 - 1}\right)}{\log_{k+1} \left(5^{k^2 - 4}\right)} = \frac{\log_4 (5^{15})}{\log_5 (5^{12})} \cdot \frac{\log_5 (5^{24})}{\log_6 (5^{21})} \cdot \frac{\log_6 (5^{35})}{\log_7 (5^{32})} \dots \frac{\log_{63} (5^{3968})}{\log_{64} (5^{3965})}$$
is equal to $\frac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. Find $m + n$. You FIRST think about the reasoning process as an internal monologue and then provide the final answer. The reasoning process MUST BE enclosed within <think> </think> tags. Please answer the final answer within the <answer> </answer> tags.
val