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 Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.util.*;
class Main
{
        public static void main(String[] args)
        {
            Scanner sc = new Scanner(System.in);
            
            double l = sc.nextInt();
            double sum = 0;
            
            for(double x=0.01 ; x<l ; x+=0.01){
                for(double y=0.01 ; y<l-x ; y+=0.01){
                    double z = l-(x+y);
                    double menseki = x*y*z;
                    if(menseki>sum){
                        sum=menseki;
                    }
                }
            }
            System.out.println(sum);
        }
}