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

#define SZ(a) (int)a.size()
#define ALL(a) a.begin(), a.end()
#define FOR(i, a, b) for (int i = (a); i<(b); ++i)
#define RFOR(i, b, a) for (int i = (b)-1; i>=(a); --i)
#define MP make_pair
#define PB push_back
#define F first
#define S second
#define FILL(a, b) memset(a, b, sizeof(a))

typedef long long LL;
typedef pair<int, int> PII;
typedef vector<int> VI;

map<VI, int> dpT;

int dp(VI cnt, int k){
	FOR(i, 1, k){
		if(i == k - i)
			cnt[i] %= 2;
		if(i >= k - i)
			break;
		int mn = min(cnt[i], cnt[k - i]);
		cnt[i] -= mn;
		cnt[k - i] -= mn;
	}
	/*
	FOR(i, 0, k)
		cout << cnt[i] << " ";
	cout << endl;
	*/
	int mx = 0;
	FOR(i, 1, k)
		mx = max(mx, cnt[i]);
	if(mx == 0)
		return 0;
	if(dpT.count(cnt))
		return dpT[cnt];
	
	int res = 1e9;
	FOR(i, 1, k){
		if(cnt[i] == 0)
			continue;
		cnt[i]--;
		FOR(j, 1, k){
			if(cnt[j] == 0)
				continue;
			cnt[j]--;
			cnt[(i + j) % k]++;
			
			res = min(res, dp(cnt, k) + 1);
			
			cnt[(i + j) % k]--;
			cnt[j]++;
		}
		cnt[i]++;
	}
	
	return dpT[cnt] = res;
}


int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n, k;
	cin >> n >> k;
	int add = 0;
	VI cnt(k);
	FOR(i, 0, n){
		int a;
		cin >> a;
		add += a / k;
		cnt[a % k]++;
	}
	cout << dp(cnt, k) + add << endl;
	
	
	
	


	
	
	
	return 0;
}