import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double l = sc.nextDouble();
        double a = l / 3;
        double ans = a * a * a;
        System.out.println(String.format("%1$.7f", ans));
    }
} 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();
        double a = l / 3;
        double ans = a * a * a;
        System.out.println(String.format("%1$.7f", ans));
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double l = sc.nextDouble();
        double a = l / 3;
        double ans = a * a * a;
        System.out.println(String.format("%1$.7f", ans));
    } main {
        Scanner sc = new Scanner(System.in);
        double l = sc.nextDouble();
        double a = l / 3;
        double ans = a * a * a;
        System.out.println(String.format("%1$.7f", ans));
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) double l = sc.nextDouble(); l sc.nextDouble() sc.nextDouble sc double a = l / 3; a l / 3 l 3 double ans = a * a * a; ans a * a * a a * a * a a a a System.out.println(String.format("%1$.7f", ans)) System.out.println System.out System System.out String.format("%1$.7f", ans) String.format String "%1$.7f" ans String[] args args public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double l = sc.nextDouble();
        double a = l / 3;
        double ans = a * a * a;
        System.out.println(String.format("%1$.7f", ans));
    }
} public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double l = sc.nextDouble();
        double a = l / 3;
        double ans = a * a * a;
        System.out.println(String.format("%1$.7f", ans));
    }
} Main
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double l = sc.nextDouble();
        double a = l / 3;
        double ans = a * a * a;
        System.out.println(String.format("%1$.7f", ans));
    }
}