public Person GetPerson()
    {
        //first person in line
        Person tmp = null;
        
        if(Count() != 0)
        {
            //pickup priority person
            tmp = busStop.poll();  
            if(Count() == 0)
            {
                //reset priority
                priority = 0;
            }
        }
        
        
        //person going to the bus
        return tmp;
    }