static int beautifulDays(int i, int j, int k) {
		return (int) IntStream.rangeClosed(i, j)
            .map(c -> Math.abs(c - reverse(c)))
            .filter(c -> c % k == 0)
            .count();
	}

private static int reverse(int n) {
		return Integer.parseInt(
        new StringBuilder(String.valueOf(n))
        .reverse().toString());
}