$N

Disciple of Lone Cloud, whether you stay or leave is yours alone to decide. Since you've decided to leave, Lone Cloud can only offer our blessing. But remember this: in this vast world, mathematics lies everywhere. When you roam the jianghu, do not abandon the art of number and measure. As a farewell gift, I leave you a riddle: One returns, then another, counting up—one, one, three, four, five, six, seven, eight. Why are phoenixes so few while common birds flock by one hundred?