using System;

using System.Collections;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

    }

    public int CountAvailableConferenceRooms(List<ConferenceRoomAvailability> cr, Interval m)

    {

        if(cr == null || cr.Count == 0 || m == null)

            return 0;

        int count = 0;

        foreach(var cra in cr)

        {

             if(IsAvailable(cra, m))

                count ++;

        }

        return count;

    }

    public bool IsAvailable(ConferenceRoomAvailability cra, Interval m)

    {

        foreach(var a in cra.crIntervals)

        {

            if((a.start <= m.start && a.end >= m.start) && (a.start >= m.start && a.start < m.end))

                return false;

        }

        return true;

    }

    public class ConferenceRoom 

    {

        public int id {get;set;}

        public string name {get;set;}

    }

    public class Interval

    {

        public int start {get;set;}

        public int end {get;set;}   

    }

    public class ConferenceRoomAvailability

    {

        public ConferenceRoom cr {get;set;}

        public List<Interval> crIntervals {get;set;}

    }

}