import java.util.ArrayList;

class Ticket
{
    public Ticket( String event )
    {
        int proposedSerialNumber;

        do
        {
            proposedSerialNumber = (int) ( Math.random( ) * 12 );
        } while( validNumbers.contains( proposedSerialNumber ) );


        eventName = event;
        serialNum = proposedSerialNumber;
        validNumbers.add( serialNum );
    }

    Ticket( String event, int sn )
    {
        eventName = event;
        serialNum = sn;
    }

    /*
     * Returns true if this ticket contains a valid serial number
     */
    public boolean isValid( )
    {
        return validNumbers.contains( serialNum );
    }

    /*
     * Returns true if this ticket contains a valid serial number
     */
    public static boolean isValidSerialNumber( int sn )
    {
        return validNumbers.contains( sn );
    }

    public int getSerialNumber( )
    {
        return serialNum;
    }

    public void printAllValidSerialNumbers( )
    {
        for( int s : validNumbers )
            System.out.println( s );
    }

    public String toString( )
    {
        return "Ticket for " + eventName + " with ser# " + serialNum;
    }

    private int serialNum;
    private String eventName;
    private static ArrayList<Integer> validNumbers = new ArrayList<Integer>( );

    static
    {
        validNumbers.add( 0 );
        validNumbers.add( 1 );
        validNumbers.add( 5 );
    }
}

class StaticDemo
{
    public static void main( String [ ] args )
    {
        for( int i = 0; i < 12; i++ )
            System.out.println( i + " " + Ticket.isValidSerialNumber( i ) );
    }
}