import java.util.Scanner;

public class Main {

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    double l = sc.nextDouble();
    sc.close();

    double a = l / 3.0;
    double answer = a * a * a;
    System.out.println(answer);
  }
} import java.util.Scanner; Scanner java.util public class Main {

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    double l = sc.nextDouble();
    sc.close();

    double a = l / 3.0;
    double answer = a * a * a;
    System.out.println(answer);
  }
} Main public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    double l = sc.nextDouble();
    sc.close();

    double a = l / 3.0;
    double answer = a * a * a;
    System.out.println(answer);
  } main {
    Scanner sc = new Scanner(System.in);
    double l = sc.nextDouble();
    sc.close();

    double a = l / 3.0;
    double answer = a * a * a;
    System.out.println(answer);
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) double l = sc.nextDouble(); l sc.nextDouble() sc.nextDouble sc sc.close() sc.close sc double a = l / 3.0; a l / 3.0 l 3.0 double answer = a * a * a; answer a * a * a a * a * a a a a System.out.println(answer) System.out.println System.out System System.out answer String[] args args public class Main {

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    double l = sc.nextDouble();
    sc.close();

    double a = l / 3.0;
    double answer = a * a * a;
    System.out.println(answer);
  }
} public class Main {

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    double l = sc.nextDouble();
    sc.close();

    double a = l / 3.0;
    double answer = a * a * a;
    System.out.println(answer);
  }
} Main
import java.util.Scanner;

public class Main {

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    double l = sc.nextDouble();
    sc.close();

    double a = l / 3.0;
    double answer = a * a * a;
    System.out.println(answer);
  }
}