Wrapper Promotion
A bar costs C. You have M money. Every W wrappers can be exchanged for one more bar (which yields a wrapper too). How many bars do you eat in total?
Input: one line with three integers M C W.
Output: the total bars eaten.
Constraints:
- 1 ≤ C ≤ M ≤ 1018
- 2 ≤ W ≤ 109
Sample Tests
Input 1
16 2 2
Output 1
15
Input 2
10 10 5
Output 2
1
Discussion (opens after you solve — no spoilers before)
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