6 lines
233 B
Python
6 lines
233 B
Python
paper = [[0]*100 for _ in range(100)]
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for _ in range(int(input())):
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x, y = map(int, input().split())
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for i in range(y-1, y+9):
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paper[i][x-1:x+9] = [1]*10
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print(sum(paper[i][j] for i in range(100) for j in range(100))) |