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\[ \sum_{i = 1}^{\left\lfloor \log_3 \frac{m + 3}{4} \right\rfloor} \max\left\{ 0, \left\lfloor \frac{m + 3}{3^i} \right\rfloor - 3 \right\} \]
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Sun, 01 Dec 2019 18:36 GMT