Blinky good riddle
Day one: cut off a segment and pay them. They now have one segment.
Day three: Give them the single segment again. They now have three segments
Day four: give them the remaining piece with 4 segments and ask for all the other bits back. They now have 4 segments.
Day five: give them the single segment. They now have 5 segments.
Day 7: give them the single segment. They now have 7 segments.