import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double length = sc.nextDouble();
        double oneLength = length / 3;
        double result = oneLength * oneLength * oneLength;
        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);
        double length = sc.nextDouble();
        double oneLength = length / 3;
        double result = oneLength * oneLength * oneLength;
        System.out.println(result);
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double length = sc.nextDouble();
        double oneLength = length / 3;
        double result = oneLength * oneLength * oneLength;
        System.out.println(result);
    } main {
        Scanner sc = new Scanner(System.in);
        double length = sc.nextDouble();
        double oneLength = length / 3;
        double result = oneLength * oneLength * oneLength;
        System.out.println(result);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) double length = sc.nextDouble(); length sc.nextDouble() sc.nextDouble sc double oneLength = length / 3; oneLength length / 3 length 3 double result = oneLength * oneLength * oneLength; result oneLength * oneLength * oneLength oneLength * oneLength * oneLength oneLength oneLength oneLength 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);
        double length = sc.nextDouble();
        double oneLength = length / 3;
        double result = oneLength * oneLength * oneLength;
        System.out.println(result);
    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double length = sc.nextDouble();
        double oneLength = length / 3;
        double result = oneLength * oneLength * oneLength;
        System.out.println(result);
    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double length = sc.nextDouble();
        double oneLength = length / 3;
        double result = oneLength * oneLength * oneLength;
        System.out.println(result);
    }
}
