#include <bits/stdc++.h>
using namespace std;
int main(){
	int n,k=0;
	cin>>n;
	while(n!=1){
		if(n%2==0)
			n/=2;
		else
			n=n*3+1;
		k++;
	}
	cout<<k;
	
	return 0;
	}

/**************************************************************
	Problem: 1241
	User: fzy001
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/