Editorial for Mock CCC '19 Contest 2 J3 - Tudor Buys Some Tea

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To solve the subtask, note that Tudor will not be able to get any free tea. Therefore, the answer is $N$ ~N~.

To solve the problem, we need to compute the maximum number of free cups of tea that Tudor can obtain. If we think about "bundles" of $K+1$ ~K+1~ cups of tea, where Tudor buys $K$ ~K~ cups of tea and gets one cup of free tea, we note that Tudor can get exactly $\left\lfloor \dfrac{N}{K+1} \right\rfloor$ bundles, which is exactly how many cups of free tea he can get. Therefore, the answer is $N - \left\lfloor \dfrac{N}{K+1} \right\rfloor$ .

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