Ограничения: время – 250ms/500ms, память – 256MiB Ввод: input.txt или стандартный ввод Вывод: output.txt или стандартный вывод 
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All travelers visiting the Emerald City are given glasses with green lenses.
In honor of the city's anniversary, Great and Powerful Oz decided to add a box with a gift to the glasses.
The box has a cubic shape with an edge size of `R`. The box must be covered with green paper.
Determine how many boxes can be covered with `R xx R` squares cut from a sheet of paper measuring `W xx H`.
The first line of input contains three integers `R`, `W`, `H` (`1<=R<=min(W,H), W*H<=10^9`).
Output one integer — the number of boxes.
```sample Sample Input
2 5 10
```
```sample Sample Output
1
```