#include<bits/stdc++.h>
using namespace std;
int s,n;
int main(){
	cin>>n;
	while(n!=1){
		if(n%2==0){
			n/=2;
		}else{
			n=n*3+1;
		}
		s++;
	}
	cout<<s;
	return 0;
}
/**************************************************************
	Problem: 1241
	User: zhangziang
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/