import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int L = scanner.nextInt();
        scanner.close();

        double side = L / 3.0;

        System.out.println(Math.pow(side, 3));
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int L = scanner.nextInt();
        scanner.close();

        double side = L / 3.0;

        System.out.println(Math.pow(side, 3));
    }
} Main public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int L = scanner.nextInt();
        scanner.close();

        double side = L / 3.0;

        System.out.println(Math.pow(side, 3));
    } main {
        Scanner scanner = new Scanner(System.in);
        int L = scanner.nextInt();
        scanner.close();

        double side = L / 3.0;

        System.out.println(Math.pow(side, 3));
    } Scanner scanner = new Scanner(System.in); scanner new Scanner(System.in) int L = scanner.nextInt(); L scanner.nextInt() scanner.nextInt scanner scanner.close() scanner.close scanner double side = L / 3.0; side L / 3.0 L 3.0 System.out.println(Math.pow(side, 3)) System.out.println System.out System System.out Math.pow(side, 3) Math.pow Math side 3 String[] args args public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int L = scanner.nextInt();
        scanner.close();

        double side = L / 3.0;

        System.out.println(Math.pow(side, 3));
    }
} public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int L = scanner.nextInt();
        scanner.close();

        double side = L / 3.0;

        System.out.println(Math.pow(side, 3));
    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int L = scanner.nextInt();
        scanner.close();

        double side = L / 3.0;

        System.out.println(Math.pow(side, 3));
    }
}
