import java.math.BigDecimal;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        BigDecimal ll = sc.nextBigDecimal();
        BigDecimal ans2 = ll.divide(new BigDecimal(3.0), 7, BigDecimal.ROUND_HALF_UP);
        BigDecimal ans3 = ans2.multiply(ans2).multiply(ans2);
        System.out.println(ans3);
    }
} import java.math.BigDecimal; BigDecimal java.math import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        BigDecimal ll = sc.nextBigDecimal();
        BigDecimal ans2 = ll.divide(new BigDecimal(3.0), 7, BigDecimal.ROUND_HALF_UP);
        BigDecimal ans3 = ans2.multiply(ans2).multiply(ans2);
        System.out.println(ans3);
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        BigDecimal ll = sc.nextBigDecimal();
        BigDecimal ans2 = ll.divide(new BigDecimal(3.0), 7, BigDecimal.ROUND_HALF_UP);
        BigDecimal ans3 = ans2.multiply(ans2).multiply(ans2);
        System.out.println(ans3);
    } main {
        Scanner sc = new Scanner(System.in);
        BigDecimal ll = sc.nextBigDecimal();
        BigDecimal ans2 = ll.divide(new BigDecimal(3.0), 7, BigDecimal.ROUND_HALF_UP);
        BigDecimal ans3 = ans2.multiply(ans2).multiply(ans2);
        System.out.println(ans3);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) BigDecimal ll = sc.nextBigDecimal(); ll sc.nextBigDecimal() sc.nextBigDecimal sc BigDecimal ans2 = ll.divide(new BigDecimal(3.0), 7, BigDecimal.ROUND_HALF_UP); ans2 ll.divide(new BigDecimal(3.0), 7, BigDecimal.ROUND_HALF_UP) ll.divide ll new BigDecimal(3.0) 7 BigDecimal.ROUND_HALF_UP BigDecimal BigDecimal.ROUND_HALF_UP BigDecimal ans3 = ans2.multiply(ans2).multiply(ans2); ans3 ans2.multiply(ans2).multiply(ans2) ans2.multiply(ans2).multiply ans2.multiply(ans2) ans2.multiply ans2 ans2 ans2 System.out.println(ans3) System.out.println System.out System System.out ans3 String[] args args public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        BigDecimal ll = sc.nextBigDecimal();
        BigDecimal ans2 = ll.divide(new BigDecimal(3.0), 7, BigDecimal.ROUND_HALF_UP);
        BigDecimal ans3 = ans2.multiply(ans2).multiply(ans2);
        System.out.println(ans3);
    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        BigDecimal ll = sc.nextBigDecimal();
        BigDecimal ans2 = ll.divide(new BigDecimal(3.0), 7, BigDecimal.ROUND_HALF_UP);
        BigDecimal ans3 = ans2.multiply(ans2).multiply(ans2);
        System.out.println(ans3);
    }
} Main
import java.math.BigDecimal;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        BigDecimal ll = sc.nextBigDecimal();
        BigDecimal ans2 = ll.divide(new BigDecimal(3.0), 7, BigDecimal.ROUND_HALF_UP);
        BigDecimal ans3 = ans2.multiply(ans2).multiply(ans2);
        System.out.println(ans3);
    }
}
