#include <cstring>
#include <fstream>
#include <algorithm>
 
using namespace std;
 
int N, M, R, C;
int A[16][800];
int S[800], result;
 
int main()
{
    ifstream fin("elimin.in");
    ofstream fout("elimin.out");
 
    fin >> N >> M >> R >> C;
 
    if (N <= M)
        for (int i = 1; i <= N; ++i)
            for (int j = 1; j <= M; ++j)
                fin >> A[i][j];
    else
    {
        for (int i = 1; i <= N; ++i)
            for (int j = 1; j <= M; ++j)
                fin >> A[j][i];
        swap(N, M);
        swap(R, C);
    }
 
    for (int i = 0; i < (1 << N); ++i)
    {
        int nrb = 0, aux = i;
        while (aux) ++nrb, aux &= aux - 1;
 
        if (nrb != R) continue;
 
        memset(S, 0, sizeof(S));
 
        int nows = 0;
        for (int k = 1; k <= M; ++k)
            for (int j = 1; j <= N; ++j)
                if (!(i & (1 << (j - 1))))
                {
                    S[k] += A[j][k];
                    nows += A[j][k];
                }
 
        sort(S + 1, S + M + 1);
        for (int j = 1; j <= C; ++j)
            nows -= S[j];
 
        result = max(result, nows);
    }
 
    fout << result;
 
    fin.close();
    fout.close();
}