#include <bits/stdc++.h>
#define newline '\n'
using namespace std;
ifstream fin("elimin.in");
ofstream fout("elimin.out");
///***********************
const int NMAX = 15, MMAX = 7300;
int matrix[NMAX][MMAX], sumCol[MMAX];
int n, m, r, c, ans;

void read()
{
    fin >> n >> m >> r >> c;
    if (n > m)
    {
        swap(n, m);
        swap(r, c);
    }
    for (int i = 0; i < n; i++)
        for (int j = 0; j < m; j++)
            fin >> matrix[i][j];
}

void solve()
{
    for (int state = 0; state < NMAX; state++)
    {
        if (state != r)
            continue;
        fill(sumCol, sumCol + n, 0);
        for (int i = 0; i < n; i++)
        {
            if (!bool((1 << state) & i))
            {
                for (int j = 0; j < m; j++)
                    sumCol[j] += matrix[i][j];
            }
        }
        sort(sumCol, sumCol + m);
        int sum = 0;
        for (int j = c; j < m; j++)
            sum += sumCol[j];
        ans = max(ans, sum);
    }
    fout << ans << newline;
}

int main()
{
    read();
    solve();
    fout.close();
    return 0;
}