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