Java Land Magical unicorn 3

MagicalLand.java

import java.util.HashSet;
import java.util.Set;

public class MagicalLand {
    public static void main(String[] args) {
        for (int i = 0; i < (Math.random() * 500) + 2; i++) {
            if (Unicorn.pat()) {
                System.out.println("UNICORN #1: PAT THIS UNICORN ONCE");
            }
        }

        for (int i = 0; i < (Math.random() * 500) + 2; i++) {
            if (Unicorn.pat()) {
                System.out.println("UNICORN #2: PAT THIS UNICORN ONCE");
            }
        }
        System.out.println("END OF PROGRAM");
    }

    public static class Unicorn {
        public static boolean pat() {
            return true;
        }
    }

    private static class System {
        public static Out out = new Out();
    }

    public static class Out {
        private static Set<String> printed = new HashSet<String>();

        public static void println(String s) {
            if (!printed.contains(s)) {
                printed.add(s);
                java.lang.System.out.println(s);
            }
        }
    }
}