#include <iostream>
#include <stdio.h>
#include <cmath>
#include <vector>
#include <tuple>
#include <bitset>
#include <map>
#include <queue>
#include <time.h>
#include <utility>
#include <numeric>
#include <deque>
#include <cassert>
#include <sstream>
#include <cctype>
#include <unordered_map>
#include <algorithm>
#include <chrono>
#define ll long long
#include <time.h>
#define mod % 1000000007
#define rep(i,n) for(long long i = 0;i < n;i ++)
ll MAX = 5'000'000'000'000'000'000LL;
using namespace std;


int main(){
  ll n,m;
  cin >> n >> m;
  map<ll,ll> mp;
  for(int i = 0;i < n;i ++){
    ll a;
    cin >> a;
    mp[a%m] ++;
  }
  ll ans = 0;
  for(auto [key,value]:mp){
    if(key == 0 or key*2 == m){
      ans ++;
    }else{
      if(mp[m-key]<value)ans += value;
      if(mp[m-key]== value and m-key>key) ans += value;
    }
  }
  cout << ans << endl;
  
  
  return 0;
}