题解 | #魔法数字变换#

import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        int count = 0;
        while(true){
            if(n == 1){
                break;
            }else {
                if(n % 2 == 0){
                    n /= 2;
                    count++;
                }else{
                    n = 3 * n + 1;
                    count++;
                }
            }
        }
        System.out.println(count);
    }    
}