#include<bits/stdc++.h>
using namespace std;

int main(){
  int n;
  cin>>n;
  auto f=[&](int n){
    if (n%2==0) return n/2;
    else return 3*n+1;
  };
  int ans=0;
  if (n==1) ans++,n=4;
  while (n!=1){
    n=f(n);
    ans++;
  }
  cout<<ans<<endl;
}