public class Probability {
    public static void main(String[] args) {
        CardDeck deck;
        int success = 0;
        int x = 1;
        int fail;
        for (int i = 0; i < 1000; i++) {
            fail = 0;
            deck = new CardDeck();
            deck.shuffle();
            while (deck.moreCards()) {
                for (x = 1; deck.moreCards(); x++) {
                    if (deck.getCard().getRank() == x) {
                        fail = 1;

                        break;
                    }
                    if (x == 3) {
                        x = 0;
                    }
                }
                if (fail == 0) {
                    success++;
                }
            }
        }
        System.out.println((double) success / 1000);
    }
}