#include <bits/stdc++.h>
using namespace std;

long long n, m, a, ans;
map<long long, long long> Mp;

int main() {    
    cin >> n >> m;

    for (int i = 0; i < n; i++) {
        cin >> a;
        Mp[a % m]++;
    }

    for (auto j : Mp) {
        long long t = j.first, u = j.second;

        if ((t == 0 || t * 2 == m) && u > 0)
            ans++;
        else  {
            long long w = Mp[m - t];

            if(u > w || (u == w && t < m - t))
                ans += u;
        }
    }

    cout << ans << endl;
}