#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001

int main(){
	
	int n;
	cin>>n;
	long long m;
	cin>>m;
	
	map<long long,long long> mp;
	rep(i,n){
		long long a;
		cin>>a;
		mp[a%m]++;
	}
	
	long long ans = 0;
	for(auto a:mp){
		long long x = a.first;
		long long y = m-x;
		y %= m;
		if(x==y)ans++;
		else{
			long long t = a.second;
			if(mp.count(y)){
				t = max(t,mp[y]);
				mp[y] = 0;
			}
			ans += t;
			mp[x] = 0;
		}
	}
	cout<<ans<<endl;
	
    return 0;
}