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

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