import java.util.Scanner;

public class Main 
{

	public static void main(String[] args) 
	{
		Scanner sc = new Scanner(System.in);
		
		float value = sc.nextFloat();
		
		
		float max = value/3;
		
		float result = max*max*max;
		System.out.println(result);
	}
} import java.util.Scanner; Scanner java.util public class Main 
{

	public static void main(String[] args) 
	{
		Scanner sc = new Scanner(System.in);
		
		float value = sc.nextFloat();
		
		
		float max = value/3;
		
		float result = max*max*max;
		System.out.println(result);
	}
} Main public static void main(String[] args) 
	{
		Scanner sc = new Scanner(System.in);
		
		float value = sc.nextFloat();
		
		
		float max = value/3;
		
		float result = max*max*max;
		System.out.println(result);
	} main {
		Scanner sc = new Scanner(System.in);
		
		float value = sc.nextFloat();
		
		
		float max = value/3;
		
		float result = max*max*max;
		System.out.println(result);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) float value = sc.nextFloat(); value sc.nextFloat() sc.nextFloat sc float max = value/3; max value/3 value 3 float result = max*max*max; result max*max*max max*max*max max max max System.out.println(result) System.out.println System.out System System.out result String[] args args public class Main 
{

	public static void main(String[] args) 
	{
		Scanner sc = new Scanner(System.in);
		
		float value = sc.nextFloat();
		
		
		float max = value/3;
		
		float result = max*max*max;
		System.out.println(result);
	}
} public class Main 
{

	public static void main(String[] args) 
	{
		Scanner sc = new Scanner(System.in);
		
		float value = sc.nextFloat();
		
		
		float max = value/3;
		
		float result = max*max*max;
		System.out.println(result);
	}
} Main
import java.util.Scanner;

public class Main 
{

	public static void main(String[] args) 
	{
		Scanner sc = new Scanner(System.in);
		
		float value = sc.nextFloat();
		
		
		float max = value/3;
		
		float result = max*max*max;
		System.out.println(result);
	}
}
