题解 | #魔法数字变换#

import java.util.Scanner;
public class Main{
    public static void main(String[]args){
        Scanner sc = new Scanner(System.in);
        int n= sc.nextInt();
        int sum=0;
        while(n!=1)
        {
            if(n%2==0)
            {
                n=n/2;
                sum++;
            }else{
                n=3*n+1;
                sum++;
            }
        }
        System.out.println(sum);
    }
}