AtCoder Beginner Contest 433

It is prohibited to use generative AI in ongoing AtCoder contests. Please refer to the following rules for more details. <a href="https://info.atcoder.jp/entry/llm-rules-en" target="_blank" rel="noopener" class="alert-link">AtCoder Rules against Generative AI - Version 20251003</a> <span style="color:red">Please note that the rules were updated on October 3, 2025.</span> For details, please see <a href="https://atcoder.jp/posts/1568" target="_blank" rel="noopener" class="alert-link">this post</a>.