#include <algorithm>
#include <complex>
#include <cstdlib>
#include <ctime>
#include <time.h>
#include <iomanip>
#include <iostream>
#include <map>
#include <math.h>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <numeric>
#include <limits>
#include <type_traits>


using namespace std;
#define SAY_YES cout << "YES" << endl;
#define SAY_Yes cout << "Yes" << endl;
#define SAY_NO cout << "NO" << endl;
#define SAY_No cout << "No" << endl;
#define IFYES(TRUE_OR_FALSE)   \
    if (TRUE_OR_FALSE)         \
    {                          \
        cout << "YES" << endl; \
    }                          \
    else                       \
    {                          \
        cout << "NO" << endl;  \
    }
#define IFYes(TRUE_OR_FALSE)   \
    if (TRUE_OR_FALSE)         \
    {                          \
        cout << "Yes" << endl; \
    }                          \
    else                       \
    {                          \
        cout << "No" << endl;  \
    }
#define IFyes(TRUE_OR_FALSE)   \
    if (TRUE_OR_FALSE)         \
    {                          \
        cout << "yes" << endl; \
    }                          \
    else                       \
    {                          \
        cout << "no" << endl;  \
    }
#define DEBUG_OUTPUT_ARRAY(XXX, ONE)                            \
    for (int i = 0; i < (ONE); i++)                             \
    {                                                           \
        cout << "DEBUG: i = " << i << " -> " << XXX[i] << endl; \
    }
#define DEBUG_OUTPUT_ARRAY2(XXX, ONE, TWO)                             \
    for (int i = 0; i < (ONE); i++)                                    \
    {                                                                  \
        cout << "<<< i = " << i << " >>>" << endl;                     \
        for (int j = 0; j < (TWO); j++)                                \
        {                                                              \
            cout << "DEBUG: j = " << j << " -> " << XXX[i][j] << endl; \
        }                                                              \
    }
#define DEBUG_OUTPUT_ARRAY2_BOX(XXX, ONE, TWO) \
    for (int i = 0; i < (ONE); i++)            \
    {                                          \
        cout << i << "  ";                     \
        for (int j = 0; j < (TWO); j++)        \
        {                                      \
            cout << XXX[i][j] << " ";          \
        }                                      \
        cout << endl;                          \
    }

typedef pair<long long int, long long int> pll;


const long long int mod = 1000000007;
const long long int INF = 1e18;
const long double PI=3.14159265358979323; 

int res,N,K,x[200000],y[200000],mpB[4004][4004]={},mpW[4004][4004]={};
char c[200000];


int main()
{
    cout << fixed << setprecision(18);
    cin>>N>>K;
    for(long long int i = 0; i < N; i++){
        cin>>x[i]>>y[i]>>c[i];
        x[i]%=(2*K);
        y[i]%=2*K;
        if(c[i]=='B'){
            mpB[x[i]][y[i]]++;
            if(1){
                mpB[x[i]+K*2][y[i]+2*K]++;
            }
            if(1){
                mpB[x[i]+K*2][y[i]]++;
            }
            if(1){
                mpB[x[i]][y[i]+2*K]++;
            }
        }else{
            mpW[x[i]][y[i]]++;
            if(1){
                mpW[x[i]+K*2][y[i]+2*K]++;
            }
            if(1){
                mpW[x[i]+K*2][y[i]]++;
            }
            if(1){
                mpW[x[i]][y[i]+2*K]++;
            }
        }
    }
    //DEBUG_OUTPUT_ARRAY2_BOX(mpB,10,10);
    //DEBUG_OUTPUT_ARRAY2_BOX(mpW,10,10);
    for(long long int i = 0; i <= 4*K+2; i++){

        for(long long int j = 1; j <= 4*K+2; j++){
            mpB[i][j]+=mpB[i][j-1];
            mpW[i][j]+=mpW[i][j-1];
        }
    }
    for(long long int i = 1; i <=4*K+2; i++){
        for(long long int j = 0; j <= 4*K+2; j++){
            mpB[i][j]+=mpB[i-1][j];
            mpW[i][j]+=mpW[i-1][j];
        }
    }
    
    //DEBUG_OUTPUT_ARRAY2_BOX(mpB,10,10);
    //DEBUG_OUTPUT_ARRAY2_BOX(mpW,10,10);
    for(long long int i = 1; i <= K*2+1; i++){
        for(long long int j = 1; j <= 2*K+1; j++){
            int tmp=0;
            tmp=mpB[i+K-1][j+K-1]-mpB[i-1][j+K-1]-mpB[i+K-1][j-1]+mpB[i-1][j-1];
            //cout<<tmp<<" ";
            tmp+=mpB[i+2*K-1][j+2*K-1]-mpB[i+K-1][j+2*K-1]-mpB[i+2*K-1][j+K-1]+mpB[i+K-1][j+K-1];
            //cout<<tmp<<" ";
            tmp+=mpW[i+2*K-1][j+K-1]-mpW[i+K-1][j+K-1]-mpW[i+2*K-1][j-1]+mpW[i+K-1][j-1];
            //cout<<tmp<<" ";
            tmp+=mpW[i+K-1][j+2*K-1]-mpW[i-1][j+2*K-1]-mpW[i+K-1][j+K-1]+mpW[i-1][j+K-1];
            //cout<<tmp<<endl;
            
            res=max(res,tmp);
        }
    }
    
    cout<<res<<endl;
}    


Measured memory_bytes: 127104