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

/**************************************************************
	Problem: 1241
	User: wtq001
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/