HBC21645珂朵莉的数论题,数论Find the AFei Numbers题解

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AFei loves numbers. He defines thenatural number containing "520" as the AFei number, such as 1234520, 8752012 and 5201314. Now he wants to know how many AFei numbers arenot greater than n.

AFei loves numbers. He defines the natural number containing "520" as the AFei number, such as 1234520, 8752012 and 5201314. Now he wants to know how many AFei numbers are not greater than n.

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标签： HBC21645珂朵莉的数论题 数论Find the AFei Numbers题解