Problem:
Score : 300 points

Problem Statement

Given is a positive integer L.
Find the maximum possible volume of a rectangular cuboid whose sum of the dimensions (not necessarily integers) is L.

Constraints

1 ≤ L ≤ 1000

L is an integer.

Input

Input is given from Standard Input in the following format:

L

Output

Print the maximum possible volume of a rectangular cuboid whose sum of the dimensions (not necessarily integers) is L.
Your output is considered correct if its absolute or relative error from our answer is at most 10^{-6}.

Sample Input 1

3

Sample Output 1

1.000000000000

For example, a rectangular cuboid whose dimensions are 0.8, 1, and 1.2 has a volume of 0.96.

On the other hand, if the dimensions are 1, 1, and 1, the volume of the rectangular cuboid is 1, which is greater.

Sample Input 2

999

Sample Output 2

36926037.000000000000

Solution in Scala (2.11.7) (judge verdict: Accepted)

import java.util.Scanner

object Main {

  def read() = {
    val sc = new Scanner(System.in)
    val l = sc.nextInt()
    l
  }

  def solve(l:Int): Double = {
    val edge = l.toDouble/3
    edge * edge * edge
  }

  def main(args: Array[String]): Unit = {
    val l = read()
    val result = solve(l)
    printf("%f", result)
    println()
  }
}