#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("elimin.in");
ofstream g("elimin.out");
int m, n, r, c, i, j, sub[16], l, sl[550], s, nrels, s_tmp ,smax=-1, mat[550][16], tmp, sln[550];
int main()
{
    f>>m>>n>>r>>c;
    if (m>=n) {
        for (i=1; i<=m; i++)
            for (j=1; j<=n; j++)
            {
                f>>mat[i][j];
                sln[i]+=mat[i][j];
            }
    }
    else {
        for (i=1; i<=m; i++)
            for (j=1; j<=n; j++)
            {
                f>>mat[j][i];
                sln[j]+=mat[j][i];
            }
        tmp=m;m=n;n=tmp;
        tmp=r;r=c;c=tmp;
    }
    while (sub[n+1]==0) {
        l=1;
        while (sub[l]==1) {
            sub[l]=0;
            l++;
        }
        sub[l]=1;
        s_tmp=0;
        if (sub[n+1]==0) {
            for (j=1, nrels=0; j<=n; j++) if (sub[j]==1) nrels++;
            if (nrels == c) {
                for (i=1; i<=m; i++) {
                    s=0;
                    for (j=1; j<=n; j++) {
                        if (sub[j]==1) {
                            s+=mat[i][j];
                            nrels++;
                        }
                    }
                    sl[i]=sln[i]-s;
                }
                sort(sl+1, sl+m+1);
                for (i=r+1; i<=m; i++)
                    s_tmp+=sl[i];
                if (s_tmp > smax)
                    smax=s_tmp;
            }
        }
    }
    g<<smax;
    return 0;
}