题解 | #魔法数字变换#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
       int num = sc.nextInt();
       int count = 0;
       while(num!=1){
        if(num%2==0){
            num /=2;
        }else{
            num = num*3+1;
        }
        count++;
       }
       System.out.println(count);
    }
}