function numWaterBottles(numBottles: number, numExchange: number): number {
let empty = numBottles
let drink = numBottles
while(empty >= numExchange) {
const changed = Math.floor(empty / numExchange)
empty -= changed * numExchange
drink += changed
empty += changed
}
return drink
};
물 그렇게 많이 드시면 건강에 안좋습니다