#include <fstream>
#include <cstring>
#include <algorithm>
#define DIM 1000
using namespace std;

ifstream fin("elimin.in");
ofstream fout("elimin.out");
int D[DIM][DIM],N,M,R,C,s[DIM],maxim;
int main(){
    fin>>N>>M>>R>>C;
    if(M>N){
        swap(N,M);
        swap(R,C);
    }
    for(int i=1;i<=N;i++)
        for(int j=1;j<=M;j++){
            fin>>D[i][j];
        }
    for(int k=1;k<=(1<<M)-1;k++){
        int nr=0,mask=k;
        while(mask&(mask-1))
            mask=mask&(mask-1),nr++;
        nr++;
        if(nr==C)
            {
                memset(s,0,sizeof(s));
                for(int i=1;i<=N;i++){
                    for(int j=1;j<=M;j++)
                        if(!(k&(1<<(j-1))))
                            s[i]+=D[i][j];
                }
                sort(s+1,s+N+1);
                unsigned long long sum=0;
                for(int j=R+1;j<=N;j++)
                    sum+=s[j];
                if(sum>maxim)
                    maxim=sum;
            }
    }
    fout<<maxim;
    fin.close();fout.close();
    return 0;
}