return sum([(4 if x % 4 == 1 else -4) / x for x in itertools.takewhile(lambda x: x <= 2 * N - 1, itertools.count(1, 2))])
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return sum([(4 if x % 4 == 1 else -4) / x for x in itertools.takewhile(lambda x: x <= 2 * N - 1, itertools.count(1, 2))])