Flatman's Tower

Time Limit	Memory Limit	Input File	Output File
1 second	256 MiB	`Standard Input`	`Standard Output`

Problem info

- Subtask 1 (20 points) has 15 cases.
- Subtask 2 (40 points) has 11 cases.
- Subtask 3 (40 points) has 30 cases.