public class EntryPoint {
    public static void main(String[] args) {
        for (int number = 1; number < 1000; number++) {
            int sumOfDividers = 0;
            for (int divider = 1; divider < number; divider++) {
                if (number % divider == 0) {
                    sumOfDividers += divider;
                }
            }

            if (number == sumOfDividers) {
                System.out.printf("%d is perfect number\n", number);
            }
        }
    }
}