using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static string InputPattern = "InputX";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("4 2");
            WillReturn.Add("13 7 2 16");
            WillReturn.Add("1 1");
            WillReturn.Add("1 3");
            WillReturn.Add("2 4");
            WillReturn.Add("11 10");
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("3 2");
            WillReturn.Add("1 2 2");
            WillReturn.Add("1 1");
            WillReturn.Add("1 1");
            WillReturn.Add("1 3");
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("19 8");
            WillReturn.Add("70 90 200 93 73 47 87 115 193 102 50 47 146 11 134 178 175 185 41");
            WillReturn.Add("13 10");
            WillReturn.Add("20 13");
            WillReturn.Add("15 29");
            WillReturn.Add("23 27");
            WillReturn.Add("25 17");
            WillReturn.Add("20 12");
            WillReturn.Add("11 27");
            WillReturn.Add("16 12");
            WillReturn.Add("16 26");
            WillReturn.Add("18 14");
            WillReturn.Add("14 2");
            WillReturn.Add("9 6");
            WillReturn.Add("15 5");
            WillReturn.Add("22 1");
            WillReturn.Add("11 22");
            WillReturn.Add("14 20");
            WillReturn.Add("19 18");
            WillReturn.Add("30 18");
            WillReturn.Add("18 24");
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    struct ObjectInfoDef
    {
        internal long X;
        internal long Y;
        internal long History;
    }
    static List<ObjectInfoDef> mObjectInfoList = new List<ObjectInfoDef>();

    static void Main()
    {
        List<string> InputList = GetInputList();

        long[] wkArr = { };
        Action<string> SplitAct = pStr =>
            wkArr = pStr.Split(' ').Select(pX => long.Parse(pX)).ToArray();

        SplitAct(InputList[0]);
        long K = wkArr[1];

        long[] HArr = InputList[1].Split(' ').Select(pX => long.Parse(pX)).ToArray();

        long ObjectID = 0;
        foreach (string EachStr in InputList.Skip(2)) {
            SplitAct(EachStr);

            ObjectInfoDef WillAdd;
            WillAdd.X = wkArr[0];
            WillAdd.Y = wkArr[1];
            WillAdd.History = HArr[ObjectID];
            mObjectInfoList.Add(WillAdd);
            ObjectID++;
        }

        mObjectInfoList = mObjectInfoList.OrderBy(pX => pX.History).ToList();

        long RemoveCnt = 0;
        for (int I = 0; I <= mObjectInfoList.Count - 1; I++) {
            for (int J = I + 1; J <= mObjectInfoList.Count - 1; J++) {
                if (mObjectInfoList[I].History == mObjectInfoList[J].History) {
                    continue;
                }
                long DiffX = mObjectInfoList[I].X - mObjectInfoList[J].X;
                long DiffY = mObjectInfoList[I].Y - mObjectInfoList[J].Y;
                long Norm = DiffX * DiffX + DiffY * DiffY;
                if (Norm <= K * K) {
                    //Console.WriteLine("I={0},J={1}で削除", I, J);
                    RemoveCnt++;
                    break;
                }
            }
        }
        Console.WriteLine(mObjectInfoList.Count - RemoveCnt);
    }
}