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