5
Player 4 takes his own rebound and passes the ball to 3 who will then start.
Variations.
Change the passes from chest to overhead, bounce or (for the half court pass) baseball pass.
Instead of the lay-ups shots can be taken.
Put a pylon on the floor and let the players in the dribble make a cross-over or a (spin) reverse.
And as always it can be run the other way around.