using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static long[] NList => ReadLine().Split().Select(long.Parse).ToArray();
    static void Main()
    {
        var c = NList;
        var (n, m) = ((int)c[0], c[1]);
        var a = NList;
        var dic = new Dictionary<long, int>();
        foreach (var ai in a)
        {
            var mod = ai % m;
            if (dic.ContainsKey(mod)) ++dic[mod];
            else dic[mod] = 1;
        }
        var res = 0;
        var delList = new HashSet<long>();
        foreach (var kv in dic)
        {
            if (delList.Contains(kv.Key)) continue;
            if (kv.Key == 0)
            {
                ++res;
                continue;
            }
            else if (kv.Key * 2 == m)
            {
                ++res;
                continue;
            }
            var rev = dic.ContainsKey(m - kv.Key) ? dic[m - kv.Key] : 0;
            res += Math.Max(kv.Value, rev);
            delList.Add(m - kv.Key);
        }
        WriteLine(res);
    }
}