#include <iostream>
#include <algorithm>
using namespace std;

int main(void){
	int n, ct = 0;
	cin >> n;
	while (n != 1){
		if (n % 2 == 0){
			n = n / 2;
		}
		else {
			n = n * 3 + 1;
		}
		ct++;
	}
	cout << ct << endl;
}