#include #include #include #include #include #include using namespace std; using i32 = int32_t; using u32 = uint32_t; using i64 = int64_t; using u64 = uint64_t; #define rep(i,n) for(int i=0; i<(int)(n); i++) const i64 INF = 1001001001001001001; using modint = atcoder::static_modint<1000000007>; int main(){ int N; cin >> N; i64 M; cin >> M; map> A; int t = 0; rep(i,N){ i64 a; cin >> a; a %= M; if(a == 0) t = 1; else{ if(M-a < a) A[a].first++; else A[M-a].second++; } } for(auto a : A) t += max(a.second.first, a.second.second); cout << t << endl; return 0; } struct ios_do_not_sync{ ios_do_not_sync(){ std::ios::sync_with_stdio(false); std::cin.tie(nullptr); } } ios_do_not_sync_instance;