GPP Endurance Clarification

This might be a stupid question, but asking to be sure.
I’ve just hit week 2 of the GPP Endurance Bias.

The competition Lift Volume/RPE reads “1@8, 5@8 x 3 sets”

Does that mean to do the single rep @ RPE 8 only ONE time, or three times total (once in each set)?

One single, then three sets of 5