// Program 36: Armstrong Number Using Recursion

import java.util.*;
class ArmstrongRecursion
{
    static int sumCubes(int n)
    {
        if (n == 0)
        {
            return 0;
        }
        int d = n % 10;
        return d * d * d + sumCubes(n / 10);
    }
    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a three-digit number: ");
        int n = sc.nextInt();
        if (n >= 100 && n <= 999 && sumCubes(n) == n)
        {
            System.out.println("Armstrong number");
        }
        else
        {
            System.out.println("Not an Armstrong number");
        }
    }
}