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

/**************************************************************
	Problem: 1241
	User: houshanglin
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/