1001

//PAT1001
#include<iostream>
using namespace std;
int main()
{
 int n,k=0,i;
 cin>>n;
 while(n!=1)
 {
  if(n%2==0)
   n=n/2;
  else
   n=(3*n+1)/2;
  k=k+1;
 }
 cout<<k<<endl;
 return 0;
 }