#define _CRT_SECURE_NO_WARNINGS
#include "bits/stdc++.h"
#include <random>
#include <unordered_map>
#include <unordered_set>
//#include <opencv2/core.hpp>
//#include <opencv2/highgui.hpp>
//#include <opencv2/imgproc.hpp>

using namespace std;

//呪文
#define DUMPOUT cerr
#define dump(...) DUMPOUT<<"  ";DUMPOUT<<#__VA_ARGS__<<" :["<<__LINE__<<":"<<__FUNCTION__<<"]"<<endl;DUMPOUT<<"    ";dump_func(__VA_ARGS__)

typedef unsigned uint; typedef long long ll; typedef unsigned long long ull; typedef pair<int, int> pii; typedef pair<ll, ll> pll; typedef pair<double, double> pdd; typedef pair<string, string> pss;
template <typename _KTy, typename _Ty> ostream& operator << (ostream& ostr, const pair<_KTy, _Ty>& m) { ostr << "{" << m.first << ", " << m.second << "}"; return ostr; }
template <typename _KTy, typename _Ty> ostream& operator << (ostream& ostr, const map<_KTy, _Ty>& m) { if (m.empty()) { ostr << "{ }"; return ostr; } ostr << "{" << *m.begin(); for (auto itr = ++m.begin(); itr != m.end(); itr++) { ostr << ", " << *itr; } ostr << "}"; return ostr; }
template <typename _KTy, typename _Ty> ostream& operator << (ostream& ostr, const unordered_map<_KTy, _Ty>& m) { if (m.empty()) { ostr << "{ }"; return ostr; } ostr << "{" << *m.begin(); for (auto itr = ++m.begin(); itr != m.end(); itr++) { ostr << ", " << *itr; } ostr << "}"; return ostr; }
template <typename _Ty> ostream& operator << (ostream& ostr, const vector<_Ty>& v) { if (v.empty()) { ostr << "{ }"; return ostr; } ostr << "{" << v.front(); for (auto itr = ++v.begin(); itr != v.end(); itr++) { ostr << ", " << *itr; }	ostr << "}"; return ostr; }
template <typename _Ty> ostream& operator << (ostream& ostr, const set<_Ty>& s) { if (s.empty()) { ostr << "{ }"; return ostr; } ostr << "{" << *(s.begin()); for (auto itr = ++s.begin(); itr != s.end(); itr++) { ostr << ", " << *itr; }	ostr << "}"; return ostr; }
template <typename _Ty> ostream& operator << (ostream& ostr, const unordered_set<_Ty>& s) { if (s.empty()) { ostr << "{ }"; return ostr; } ostr << "{" << *(s.begin()); for (auto itr = ++s.begin(); itr != s.end(); itr++) { ostr << ", " << *itr; }	ostr << "}"; return ostr; }
template <typename _Ty> ostream& operator << (ostream& ostr, const stack<_Ty>& s) { if (s.empty()) { ostr << "{ }"; return ostr; } stack<_Ty> t(s); ostr << "{" << t.top(); t.pop(); while (!t.empty()) { ostr << ", " << t.top(); t.pop(); } ostr << "}";	return ostr; }
template <typename _Ty> ostream& operator << (ostream& ostr, const list<_Ty>& l) { if (l.empty()) { ostr << "{ }"; return ostr; } ostr << "{" << l.front(); for (auto itr = ++l.begin(); itr != l.end(); ++itr) { ostr << ", " << *itr; } ostr << "}"; return ostr; }
template <typename _KTy, typename _Ty> istream& operator >> (istream& istr, pair<_KTy, _Ty>& m) { istr >> m.first >> m.second; return istr; }
template <typename _Ty> istream& operator >> (istream& istr, vector<_Ty>& v) { for (size_t i = 0; i < v.size(); i++) istr >> v[i]; return istr; }
namespace aux { // print tuple
	template<typename Ty, unsigned N, unsigned L> struct tp { static void print(ostream& os, const Ty& v) { os << get<N>(v) << ", "; tp<Ty, N + 1, L>::print(os, v); } };
	template<typename Ty, unsigned N> struct tp<Ty, N, N> { static void print(ostream& os, const Ty& value) { os << get<N>(value); } };
}
template<typename... Tys> ostream& operator<<(ostream& os, const tuple<Tys...>& t) { os << "{"; aux::tp<tuple<Tys...>, 0, sizeof...(Tys)-1>::print(os, t); os << "}"; return os; }

template<typename A, size_t N, typename T> inline void Fill(A(&array)[N], const T &val) { std::fill((T*)array, (T*)(array + N), val); }

void dump_func() { DUMPOUT << endl; }
template <class Head, class... Tail> void dump_func(Head&& head, Tail&&... tail) { DUMPOUT << head; if (sizeof...(Tail) == 0) { DUMPOUT << " "; } else { DUMPOUT << ", "; } dump_func(std::move(tail)...); }

#define PI 3.14159265358979323846
#define EPS 1e-10
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)
#define all(j) (j).begin(), (j).end()
#define SZ(j) ((int)(j).size())
#define fake false



// [i1, i2], [j1, j2]
int sum2D(const vector<vector<int>>& sum, int i1, int j1, int i2, int j2) {
	if (i1 == 0 && j1 == 0)
		return sum[i2][j2];
	if (i1 == 0)
		return sum[i2][j2] - sum[i2][j1 - 1];
	if (j1 == 0)
		return sum[i2][j2] - sum[i1 - 1][j2];
	return sum[i2][j2] - sum[i2][j1 - 1] - sum[i1 - 1][j2] + sum[i1 - 1][j1 - 1];
}

int main() {

	cin.tie(0);
	ios::sync_with_stdio(false);

	int N, K;
	cin >> N >> K;

	vector<int> x(N), y(N);
	vector<char> c(N);
	for (int i = 0; i < N; i++) {
		cin >> x[i] >> y[i] >> c[i];
		x[i] %= 2 * K; y[i] %= 2 * K;
	}

	vector<vector<int>> black(2 * K + 1, vector<int>(2 * K + 1, 0));
	vector<vector<int>> white(2 * K + 1, vector<int>(2 * K + 1, 0));

	for (int i = 0; i < N; i++) {
		if (c[i] == 'B')
			black[y[i]][x[i]]++;
		else
			white[y[i]][x[i]]++;
	}
	for (int i = 0; i < 2 * K; i++) {
		for (int j = 0; j < 2 * K; j++) {
			black[i][j + 1] += black[i][j];
			white[i][j + 1] += white[i][j];
		}
	}
	for (int j = 0; j <= 2 * K; j++) {
		for (int i = 0; i < 2 * K; i++) {
			black[i + 1][j] += black[i][j];
			white[i + 1][j] += white[i][j];
		}
	}
	
	int ans = 0;
	for (int h = 0; h < K; h++) {
		for (int w = 0; w < K; w++) {
			// 2K * 2K 領域の左下が黒
			int ok = 0;
			ok += sum2D(black, 0, 0, K - h - 1, K - w - 1);
			ok += sum2D(black, 2 * K - h, 0, 2 * K - 1, K - w - 1);
			ok += sum2D(black, K - h, K - w, 2 * K - h - 1, 2 * K - w - 1);
			ok += sum2D(black, 0, 2 * K - w, K - h - 1, 2 * K - 1);
			ok += sum2D(black, 2 * K - h, 2 * K - w, 2 * K - 1, 2 * K - 1);
			ok += sum2D(white, 0, K - w, K - h - 1, 2 * K - w - 1);
			ok += sum2D(white, K - h, 0, 2 * K - h - 1, K - w - 1);
			ok += sum2D(white, 2 * K - h, K - w, 2 * K - 1, 2 * K - w - 1);
			ok += sum2D(white, K - h, 2 * K - w, 2 * K - h - 1, 2 * K - 1);
			ans = max(ans, ok);
			// 2K * 2K 領域の左下が白
			ok = 0;
			ok += sum2D(white, 0, 0, K - h - 1, K - w - 1);
			ok += sum2D(white, 2 * K - h, 0, 2 * K - 1, K - w - 1);
			ok += sum2D(white, K - h, K - w, 2 * K - h - 1, 2 * K - w - 1);
			ok += sum2D(white, 0, 2 * K - w, K - h - 1, 2 * K - 1);
			ok += sum2D(white, 2 * K - h, 2 * K - w, 2 * K - 1, 2 * K - 1);
			ok += sum2D(black, 0, K - w, K - h - 1, 2 * K - w - 1);
			ok += sum2D(black, K - h, 0, 2 * K - h - 1, K - w - 1);
			ok += sum2D(black, 2 * K - h, K - w, 2 * K - 1, 2 * K - w - 1);
			ok += sum2D(black, K - h, 2 * K - w, 2 * K - h - 1, 2 * K - 1);
			ans = max(ans, ok);
		}
	}

	cout << ans << endl;

	return 0;
}


Measured memory_bytes: 32640