using System;
using System.Collections.Generic;

namespace TellDontAsk1
{
    public class Calendar
    {
        private IList<Appointment> appointments = new List<Appointment>();

        public IList<Appointment> Appointments {
            get { return appointments; }
            set { appointments = value; }
        }

        public bool Free(DateTime date) {
            foreach (var appointment in appointments) {
                if (appointment.Contains(date)) {
                    return false;
                }
            }
            return true;
        }

        public Appointment AddAppointment() {
            Appointment appointment = new Appointment();
            Appointments.Add(appointment);
            return appointment;
        }
    }
}