import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        float l = sc.nextFloat();

        System.out.println(((l/3)*(l/3)*(l/3)));

    }
} import java.util.Scanner; Scanner java.util public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        float l = sc.nextFloat();

        System.out.println(((l/3)*(l/3)*(l/3)));

    }
} Main public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        float l = sc.nextFloat();

        System.out.println(((l/3)*(l/3)*(l/3)));

    } main {

        Scanner sc = new Scanner(System.in);
        float l = sc.nextFloat();

        System.out.println(((l/3)*(l/3)*(l/3)));

    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) float l = sc.nextFloat(); l sc.nextFloat() sc.nextFloat sc System.out.println(((l/3)*(l/3)*(l/3))) System.out.println System.out System System.out ((l/3)*(l/3)*(l/3)) (l/3)*(l/3)*(l/3) (l/3) l 3 (l/3) l 3 (l/3) l 3 String[] args args public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        float l = sc.nextFloat();

        System.out.println(((l/3)*(l/3)*(l/3)));

    }
} public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        float l = sc.nextFloat();

        System.out.println(((l/3)*(l/3)*(l/3)));

    }
} Main
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        float l = sc.nextFloat();

        System.out.println(((l/3)*(l/3)*(l/3)));

    }
}