You could also have defined a new variable for every holding, instead of using the interactive way. The result would have been the same and you would have not noticed any improvement, but:

1. You have just learnt the concept of variables. It is better to use them every time you could, even if it looks a silly usage.
2. You will later or sooner be using a debugger. Assigning values to variables will help you detect problems in your code.