ICPC 2019 vòng Quốc gia: Bài J

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Points: 1.70
Time limit: 1.0s
Memory limit: 512M
Input: stdin
Output: stdout

Problem type
Allowed languages
C, C++, Java, Kotlin, Pascal, PyPy, Python, Scratch

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Sample Input 1

2 3
1 1
1 2
2 2

Sample Output 1



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