1518. Water Bottles

[mah-shamim]

There are numBottles water bottles that are initially full of water. You can exchange numExchange empty water bottles from the market with one full water bottle.

The operation of drinking a full water bottle turns it into an empty bottle.

Given the two integers numBottles and numExchange, return the maximum number of water bottles you can drink.

Example 1:

• Input: numBottles = 9, numExchange = 3
• Output: 13
• Explanation: You can exchange 3 empty bottles to get 1 full water bottle.
  Number of water bottles you can drink: 9 + 3 + 1 = 13.

Example 2:

• Input: numBottles = 15, numExchange = 4
• Output: 19
• Explanation: You can exchange 4 empty bottles to get 1 full water bottle.
  Number of water bottles you can drink: 15 + 3 + 1 = 19.

Constraints:

• 1 <= numBottles <= 100.
• 2 <= numExchange <= 100