#include <fstream>
#include <algorithm>
#include <string.h>
#define sum first
#define poz second
using namespace std;
ifstream f("elimin.in");
ofstream g("elimin.out");
int n, m, l, c, x, v[20];
long long sumMax, newSum, s[7300], s_col[7300], sum;
short a[20][7300];
void aflu_solutie()
{
    newSum = 0;
    for(int j = 1; j <= m; ++j){
      sum = 0;
      for(int i = 1; i <= l; ++i)
        sum += a[v[i]][j];
        s[j] = s_col[j] - sum;
    }
    sort(s + 1, s + m + 1);
    for(int i = c + 1; i <= m; ++i)
        newSum += s[i];
    if(newSum > sumMax) sumMax = newSum;
}
void make_bkt(int k){
    for(int i = v[k - 1] + 1; i <= n; ++i){
         v[k] = i;
        if(k == l) aflu_solutie();
        else make_bkt(k + 1);
    }
}
int main()
{
    f >> n >> m >> l >> c;
    for(int i = 1; i <= n; ++i)
    for(int j = 1; j <= m; ++j){
        f >> x;
        if(n <= m){
            a[i][j] = x;
            s_col[j] += x;
        }
        else {
            a[j][i] = x;
            s_col[i] += x;
        }
    }
    if(n > m) swap(n ,m), swap(l, c);
    make_bkt(1);
    g << sumMax;
    return 0;
}