// tsukasa_diary's programing contest code template
#include <bits/stdc++.h>
using namespace std;
#define TSUKASA_DIARY_S_TEMPLATE
// define
#define for_(i,a,b) for(int i=(a);i<(b);++i)
#define for_rev(i,a,b) for(int i=(a);i>=(b);--i)
#define allof(a) (a).begin(),(a).end()
#define minit(a,b) memset(a,b,sizeof(a))
#define size_of(a) int((a).size())
#define cauto const auto
// typedef
typedef long long lint;
typedef double Double;
typedef pair< int, int > pii;
template< typename T > using Vec = vector< T >;
template< typename T > using Matrix = Vec< Vec< T > >;
template< typename T > using USet = unordered_set< T >;
template< typename T, class C > using MyUSet = unordered_set< T, C >;
template< typename T, typename F > using UMap = unordered_map< T, F >;
template< typename T, typename F, class C > using MyUMap = unordered_map< T, F, C >;
// hash
class PiiHash { public: size_t operator () (const pii& p) const { return (p.first << 16) | p.second; } };
// popcount
inline int POPCNT(int x) { return __builtin_popcount(x); }
inline int POPCNT(lint x) { return __builtin_popcount(x); }
// inf
const int iINF = 1L << 30;
const lint lINF = 1LL << 60;
// eps
const Double EPS = 1e-9;
const Double PI = acos(-1);
// inrange
template< typename T >
inline bool in_range(T v, T mi, T mx) { return mi <= v && v < mx; }
template< typename T >
inline bool in_range(T x, T y, T W, T H) { return in_range(x,0,W) && in_range(y,0,H); }
// neighbor clockwise
const int DX[4] = {0,1,0,-1}, DY[4] = {-1,0,1,0};
const int DX_[8] = {0,1,1,1,0,-1,-1,-1}, DY_[8] = {-1,-1,0,1,1,1,0,-1};
// variable update
template< typename T > inline void modAdd(T& a, T b, T mod) { a = (a + b) % mod; }
template< typename T > inline void modMul(T& a, T b, T mod) { a = (a * b) % mod; }
template< typename T > inline void minUpdate(T& a, T b) { a = min(a, b); }
template< typename T > inline void maxUpdate(T& a, T b) { a = max(a, b); }
// converter
template< typename F, typename T >
inline void convert(F& from, T& to) {
stringstream ss;
ss << from; ss >> to;
}
int N, M, X[100010];
const int MAX_X = 100000;
void solve() {
Vec< int > cnt(MAX_X + 1, 0);
for_(i,0,N) cnt[X[i]]++;
Vec< queue< int > > vque(M + 1);
Vec< int > cnt_odd(M + 1);
for_rev(x,MAX_X,1) if (cnt[x] > 0) {
if (cnt[x] % 2) {
vque[x % M].push(cnt[x] - 1);
++cnt_odd[x % M];
} else {
vque[x % M].push(cnt[x]);
}
}
int ans = 0;
for_(x,0,M) {
int a = x, b = (M - a) % M;
if (a == b) {
ans += cnt_odd[a] / 2;
} else {
ans += min(cnt_odd[a], cnt_odd[b]);
}
while (!vque[x].empty()) {
int top = vque[x].front(); vque[x].pop();
ans += top / 2;
}
}
cout << ans << endl;
}
int main() {
cin >> N >> M;
for_(i,0,N) cin >> X[i];
solve();
}