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def euler_028():
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total = 1
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current_corner = 3
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for n in range(3, 1002, 2):
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total += 4 * current_corner + 6 * (n - 1)
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current_corner += 4 * n - 2
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return total
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if __name__ == "__main__":
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print("e028.py: {}".format(euler_028()))
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assert(euler_028() == 669171001)
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