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    This comment is hidden because it contains spoiler information about the solution

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    I ran into the same problem. Update sum with the following code in place of yours:

    sum = int(sum//2)

    Yes, that's TWO division signs. This returns a result rounded to the nearest whole number. You need that or else the new sum value will throw off certain iterations because of the remaining decimal value.

    I never knew about the // operator until looking stuff up for this kata.