2025-10-01 08:43:05 +0300 MSK

class Solution:
    def numWaterBottles(self, numBottles: int, numExchange: int) -> int:
        res, empty = 0, 0
        while numBottles > 0:
            res += numBottles
            empty += numBottles
            numBottles, empty = empty // numExchange, empty % numExchange
        return res