1. Problem statement: The user wrote "hello". 2. Formula and rules: No mathematical formula is required for a simple greeting, but I will follow the rules for responses and language. 3. Important rules: I will reply in the same language the user used, keep the answer short and friendly, and provide clear steps. 4. Intermediate work: Identify the language as English and compose a concise greeting response. 5. Solution: Hello! How can I help you today? 6. Final answer: Hello! How can I help you today?