import java.text.DecimalFormat;
import java.util.*;

public class Main {

    public static void main(String [] commandLineArgument){

        Scanner input = new Scanner(System.in);
        double l  = input.nextDouble();
        double single = l/3;
        double answer = single * single * single;
        System.out.println(String.format("%.6f" , answer));
        input.close();
    }

}
 import java.text.DecimalFormat; DecimalFormat java.text import java.util.*; util.* java public class Main {

    public static void main(String [] commandLineArgument){

        Scanner input = new Scanner(System.in);
        double l  = input.nextDouble();
        double single = l/3;
        double answer = single * single * single;
        System.out.println(String.format("%.6f" , answer));
        input.close();
    }

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

        Scanner input = new Scanner(System.in);
        double l  = input.nextDouble();
        double single = l/3;
        double answer = single * single * single;
        System.out.println(String.format("%.6f" , answer));
        input.close();
    } main {

        Scanner input = new Scanner(System.in);
        double l  = input.nextDouble();
        double single = l/3;
        double answer = single * single * single;
        System.out.println(String.format("%.6f" , answer));
        input.close();
    } Scanner input = new Scanner(System.in); input new Scanner(System.in) double l  = input.nextDouble(); l input.nextDouble() input.nextDouble input double single = l/3; single l/3 l 3 double answer = single * single * single; answer single * single * single single * single * single single single single System.out.println(String.format("%.6f" , answer)) System.out.println System.out System System.out String.format("%.6f" , answer) String.format String "%.6f" answer input.close() input.close input String [] commandLineArgument commandLineArgument public class Main {

    public static void main(String [] commandLineArgument){

        Scanner input = new Scanner(System.in);
        double l  = input.nextDouble();
        double single = l/3;
        double answer = single * single * single;
        System.out.println(String.format("%.6f" , answer));
        input.close();
    }

} public class Main {

    public static void main(String [] commandLineArgument){

        Scanner input = new Scanner(System.in);
        double l  = input.nextDouble();
        double single = l/3;
        double answer = single * single * single;
        System.out.println(String.format("%.6f" , answer));
        input.close();
    }

} Main
import java.text.DecimalFormat;
import java.util.*;

public class Main {

    public static void main(String [] commandLineArgument){

        Scanner input = new Scanner(System.in);
        double l  = input.nextDouble();
        double single = l/3;
        double answer = single * single * single;
        System.out.println(String.format("%.6f" , answer));
        input.close();
    }

}

