import java.util.Scanner;

class Main {
    
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        double l = scanner.nextDouble();
        scanner.close();
        double per = l/3.0;
        double result = per*per*per;
        System.out.println(result);
    }
} import java.util.Scanner; Scanner java.util class Main {
    
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        double l = scanner.nextDouble();
        scanner.close();
        double per = l/3.0;
        double result = per*per*per;
        System.out.println(result);
    }
} Main public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        double l = scanner.nextDouble();
        scanner.close();
        double per = l/3.0;
        double result = per*per*per;
        System.out.println(result);
    } main {
        Scanner scanner = new Scanner(System.in);
        double l = scanner.nextDouble();
        scanner.close();
        double per = l/3.0;
        double result = per*per*per;
        System.out.println(result);
    } Scanner scanner = new Scanner(System.in); scanner new Scanner(System.in) double l = scanner.nextDouble(); l scanner.nextDouble() scanner.nextDouble scanner scanner.close() scanner.close scanner double per = l/3.0; per l/3.0 l 3.0 double result = per*per*per; result per*per*per per*per*per per per per System.out.println(result) System.out.println System.out System System.out result String[] args args
import java.util.Scanner;

class Main {
    
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        double l = scanner.nextDouble();
        scanner.close();
        double per = l/3.0;
        double result = per*per*per;
        System.out.println(result);
    }
}