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with open("input2_pre.txt") as f:
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print(sum([(([int(a) for a in line.strip().split()][1]) + ((3, 0, 6)[((([int(a) for a in line.strip().split()][0]) - ([int(a) for a in line.strip().split()][1])) % 3)])) for line in f.readlines()])) |
