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