using System;

public class Program

{

    public static void Main()

    {

        var intervals = new int [,] {{0,30},{5,10},{15,20}};

        var result = CanAttendMeetings(intervals);

        Console.WriteLine(result);

    }

    public static bool CanAttendMeetings(int[,] intervals) {

        for(int i = 0; i < intervals.GetLength(0); i++)

        {

            var start = intervals[i,0];

            var end = intervals[i,1];

            for(int j = i; j < intervals.GetLength(0); j++)

            {

                if(intervals[j,0] >= start || intervals[j,1] <= end)

                {

                    return false;

                }

            }

        }

        return true;

    }

}