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