#include <iostream>
using namespace std;

int main() {
	
	int n = 0;			//定义变量
	int flag = 0;		//步数
	cin >> n;

	while (n != 1) {
		//为偶数时
		if (n % 2 == 0) {
			n /= 2;
		}		
		//为奇数时
		else{
			n = 3 * n + 1;
		}
		flag++;
	}

	cout << flag;

	system("pause");
	return 0;
 }