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