With this schedule, you need six tapes if you want to reuse daily tapes, or nine tapes if you want to use four different daily tapes: one tape for the level 0, four tapes for Fridays, and one or four daily tapes.
If you need to restore a complete file system, you need the following tapes: the level 0, the most recent Friday tape, and the most recent daily tape since the last Friday tape, if any.