Reduce to One

**Description:** Start from n. One step: if n is even, n becomes n/2; otherwise n becomes 3n+1. Count the steps until n becomes 1. **Input:** One integer n (1 ≤ n ≤ 10^6). **Output:** One integer — the number of steps. **Example:** 6 → 6→3→10→5→16→8→4→2→1 → 8 steps.