Đèn hiệu đơn độc

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Points: 100.00 (partial)
Time limit: 3.0s
Memory limit: 256M
Input: stdin
Output: stdout
Problem source:
den-hieu-don-doc.md
Problem type
Allowed languages
C, C++, Java, Pascal, Python

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Ví dụ

Input
5 4 2
3 1 4 2 2
1 3 10
2 5 7
4 5 6
1 5 -4
Output
18
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