Going Home

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

Problem info

- Subtask 1 (20 points) has 20 cases.
- Subtask 2 (25 points) has 29 cases.
- Subtask 3 (30 points) has 32 cases.
- Subtask 4 (25 points) has 52 cases.
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