C89 Training

Running, gradually I feel a little tired, but it is only a little tired, I do not know how long it will be before I feel tired.

Passing by the night when I was sitting on a chair by the roadside, I asked him, "How long have I been running? Have you counted how many laps I've been running?"

Nightmare looked at me and said, "You've only run 54 laps. It's only 30 minutes. If you want to get tired