#include<bits/stdc++.h> 
using namespace std; 
int main(){ 
    int a,i; 
    double sum=0,sum1=0;
    cin>>a;
    while (a>1){
        if(a%2==0){
           a=a/2; 
           sum=sum+1;
        }
        else{
           a=3*a+1; 
           sum1=sum1+1;
        }
    }
    cout<<sum1+sum;
}