using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;
using System.Text;
//using static CompLib.CompLib;
//using DataStructure;

namespace atcoder
{

    class Program
    {
        const int intMax = 1000000000;
        const long longMax = 2000000000000000000;
        static void Main(string[] args)
        {
            var NM = Console.ReadLine().Trim().Split().Select(long.Parse).ToArray();
            var A = Console.ReadLine().Trim().Split().Select(long.Parse).ToArray();
            for (int i = 0; i < NM[0]; i++)
            {
                A[i] %= NM[1];
            }
            var list = new Dictionary<long, int>();
            for (int i = 0; i < NM[0]; i++)
            {
                if (!list.ContainsKey(A[i]))
                {
                    list.Add(A[i], 1);
                }
                else
                {
                    list[A[i]]++;
                }
            }
            list = list.OrderBy(a => a.Key).ToDictionary(a => a.Key, a => a.Value);
            long ans = NM[0];
            int idx = 0;
            if (list.Count % 2 == 0)
            {
                idx = list.Count / 2 - 1;
            }
            else
            {
                idx = list.Count / 2;
            }
            for (int i = 0; i <= idx; i++)
            {
                if (list.ElementAt(i).Key == 0 || (NM[1] % 2 == 0 && list.ElementAt(i).Key == NM[1] / 2))
                {
                    ans -= list.ElementAt(i).Value - 1;
                }
                else if (list.ContainsKey(NM[1] - list.ElementAt(i).Key))
                {
                    ans -= Math.Min(list[NM[1] - list.ElementAt(i).Key], list.ElementAt(i).Value);
                }
            }
            Console.WriteLine(ans);
        }
    }
}