import java.util.*;

public class Main {

    public static void main(String[] args) {
        Scanner stdIn = new Scanner(System.in);
        float L = stdIn.nextFloat();
        stdIn.close();
        L = L / 3;
        System.out.println(L*L*L);
    }
} import java.util.*; util.* java public class Main {

    public static void main(String[] args) {
        Scanner stdIn = new Scanner(System.in);
        float L = stdIn.nextFloat();
        stdIn.close();
        L = L / 3;
        System.out.println(L*L*L);
    }
} Main public static void main(String[] args) {
        Scanner stdIn = new Scanner(System.in);
        float L = stdIn.nextFloat();
        stdIn.close();
        L = L / 3;
        System.out.println(L*L*L);
    } main {
        Scanner stdIn = new Scanner(System.in);
        float L = stdIn.nextFloat();
        stdIn.close();
        L = L / 3;
        System.out.println(L*L*L);
    } Scanner stdIn = new Scanner(System.in); stdIn new Scanner(System.in) float L = stdIn.nextFloat(); L stdIn.nextFloat() stdIn.nextFloat stdIn stdIn.close() stdIn.close stdIn L = L / 3 L L / 3 L 3 System.out.println(L*L*L) System.out.println System.out System System.out L*L*L L*L*L L L L String[] args args public class Main {

    public static void main(String[] args) {
        Scanner stdIn = new Scanner(System.in);
        float L = stdIn.nextFloat();
        stdIn.close();
        L = L / 3;
        System.out.println(L*L*L);
    }
} public class Main {

    public static void main(String[] args) {
        Scanner stdIn = new Scanner(System.in);
        float L = stdIn.nextFloat();
        stdIn.close();
        L = L / 3;
        System.out.println(L*L*L);
    }
} Main
import java.util.*;

public class Main {

    public static void main(String[] args) {
        Scanner stdIn = new Scanner(System.in);
        float L = stdIn.nextFloat();
        stdIn.close();
        L = L / 3;
        System.out.println(L*L*L);
    }
}
