public class NumberCheck {
	public static void main(String[] args) {
		System.out.print(check("8642"));
	}

	public static boolean check(String number) {
		String newnum = "";
		for (int i = 0; i < number.length(); i++) {
			int a = Character.getNumericValue(number.charAt(number.length() - 1 - i));
			if (i % 2 != 0) {
				a = 2 * a;
				if (a > 10) {
					a = (a % 10) + 1;
				}
			}
			newnum = "" + a;
		}
		int sum = 0;
		for (int i = 0; i < newnum.length(); i++) {
			sum = sum + Character.getNumericValue(newnum.charAt(i));

		}
		if (sum % 10 == 0) {
			return true;
		} else {
			return false;
		}
	}
}