#nullable enable

#region
var (_input, _iter) = (Array.Empty<string>(), 0);
T I<T>() where T : IParsable<T>
{
    while (_iter >= _input.Length) (_input, _iter) = (Console.ReadLine()!.Trim().Split(' '), 0);
    return T.Parse(_input[_iter++], null);
}
#endregion

var n = I<long>();
var ans = 0;
while (n != 1)
{
    if (n % 2 == 0) n /= 2;
    else n = n * 3 + 1;
    ans++;
}
Console.WriteLine(ans);