C25 Infinite Cycle

He kept walking, and at the same time, he was silently counting the number of floors, wanting to know how many floors he had actually taken.

After walking for a distance, I suddenly stopped in my tracks. This is because I had already walked up to the 17th floor.

The seventeenth floor! If you go down one level, wouldn't that be 18 levels? Eighteen levels of hell?

At this moment