How many coins? - The Sequel

My nearest doughnut stall sells donuts in packs of $1$ , $2$ , or $5$ . I keep on ordering such doughnut packs uniformly at random until I have a total of more than or equal to $400$ doughnuts.

If the expected number of $5$ packs I ordered is $n$ , what is the value of $\left\lfloor 10n\right\rfloor$ ?

Thanks to @bobbym none for checking the answers