Imagine a regular octagon with vertices labeled 1 to 8 in a clockwise direction, with 1 at the very top. A black dot starts at vertex 1. In the first step, it moves 1 vertex clockwise (to 2). In the second step, it moves 2 vertices clockwise (to 4). In the third step, it moves 3 vertices clockwise (to 7). If this accelerating movement pattern continues, at which vertex will the dot land after the fifth step?