// This takes one group summing to 0 at a time, and only considers groups with counts at most the
// number of available stones.
#include <cassert>
#include <iostream>
#include <map>
#include <unordered_map>
#include <vector>

using namespace std;

// Tuples that can be removed. The inner vector has size k.
vector<vector<int>> zeros;
void init_zeros(int k, vector<int>& cnt) {
	cnt.resize(8, 0);
	for(int i1 = 0; i1 <= k && i1 <= cnt[1]; ++i1) {
		for(int i2 = 0; i1 + i2 <= k && i2 <= cnt[2]; ++i2) {
			for(int i3 = 0; i1 + i2 + i3 <= k && i3 <= cnt[3]; ++i3) {
				for(int i4 = 0; i1 + i2 + i3 + i4 <= k && i4 <= cnt[4]; ++i4) {
					for(int i5 = 0; i1 + i2 + i3 + i4 + i5 <= k && i5 <= cnt[5]; ++i5) {
						for(int i6 = 0; i1 + i2 + i3 + i4 + i5 + i6 <= k && i6 <= cnt[6]; ++i6) {
							for(int i7 = 0; i1 + i2 + i3 + i4 + i5 + i6 + i7 <= k && i7 <= cnt[7];
							    ++i7) {
								int s =
								    1 * i1 + 2 * i2 + 3 * i3 + 4 * i4 + 5 * i5 + 6 * i6 + 7 * i7;
								if(s > 0 && s % k == 0) {
									zeros.push_back({0, i1, i2, i3, i4, i5, i6, i7});
								}
							}
						}
					}
				}
			}
		}
	}
	cnt.resize(k);
}

map<vector<int>, int> cache;
int k;
int solve(vector<int>& v) {
	if(cache.contains(v)) {
		return cache[v];
	}
	int best = -1;
	for(auto& cnt : zeros) {
		bool ok = true;
		for(int j = 1; j < k; ++j) ok &= cnt[j] <= v[j];
		if(!ok) continue;
		for(int j = 1; j < k; ++j) v[j] -= cnt[j];
		best = max(best, 1 + solve(v));
		for(int j = 1; j < k; ++j) v[j] += cnt[j];
	}
	assert(best >= 1);

	return cache[v] = best;
}
int main() {
	int n;
	cin >> n >> k;
	int sum = 0;
	vector<int> cnt(k);
	int ans = 0;
	for(int i = 0; i < n; ++i) {
		int x;
		cin >> x;
		sum += x;
		if(x % k == 0) {
			++ans;
		} else {
			cnt[x % k] += 1;
		}
	}

	// opposite pairs
	for(int i = 1; 2 * i < k; ++i) {
		auto x = min(cnt[i], cnt[k - i]);
		cnt[i] -= x;
		cnt[k - i] -= x;
		ans += x;
	}
	if(k % 2 == 0) {
		ans += cnt[k / 2] / 2;
		cnt[k / 2] %= 2;
	}

	init_zeros(k, cnt);

	cache[vector<int>(k, 0)] = 0;

	cout << sum / k - ans - solve(cnt) << endl;
}