using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace mekkmester
{
    internal class Program
    {
        static int[] t;
        class pont
        {

            public int mettol;
            public int meddig;
            public pont()
            {
                t = Console.ReadLine().Split().Select(int.Parse).ToArray();
                mettol = t[0];
                meddig = t[1];
            }
            static void Main(string[] args)
            {
                t = Console.ReadLine().Split().Select(int.Parse).ToArray();
                int N = t[0]; int H = t[1];
                List<pont> G = new List<pont>();
                for (int i = 0; i < N; i++)
                {
                    t = Console.ReadLine().Split().Select(int.Parse).ToArray();
                    G.Add(new pont());
                }
                var gr=G.OrderBy(x => x.mettol).ToList();
            }
        }
    }
}