#include<cstdio>
#include<algorithm>
using namespace std;
#define N 2000
int n,m,i,j,a[20][N],r,c,k,x,s[20],d,u,l[20],q[N];

int cmp(int a,int b)
{return a<b;}

int main()
{FILE *f=fopen("elimin.in","r"),*g=fopen("elimin.out","w");
fscanf(f,"%d%d%d%d",&n,&m,&r,&c);
if(n>m)
     {for(i=1;i<=n;i++)
     for(j=1;j<=m;j++)
            fscanf(f,"%d",&a[j][i]);
     x=n,n=m,m=x,x=r,r=c,c=x;}
else
     for(i=1;i<=n;i++)
     for(j=1;j<=m;j++)
            fscanf(f,"%d",&a[i][j]);
if(r)
     for(k=1;k;)
            {s[k]++;
            if(s[k]<=n-r+k)
                   if(k==r)
                           {for(i=1;i<=r;i++)
                                   l[s[i]]=1;
                           for(j=1;j<=m;j++)
                                   q[j]=0;
                           for(i=1,d=0;i<=n;i++)
                           if(!l[i])
                                   for(j=1;j<=m;j++)
                                          q[j]+=a[i][j],d+=a[i][j];
                           else
                                   l[i]=0;
                           stable_sort(q+1,q+m+1,cmp);
                           for(j=1;j<=c;j++)
                                   d-=q[j];
                           if(d>u)
                                   u=d;}
                   else
                           k++,s[k]=s[k-1];
            else
                   k--;}
else
     if(c)
            {for(i=1;i<=m;i++)
                   q[i]=0;
            for(i=1,u=0;i<=n;i++)
            for(j=1;j<=m;j++)
                   q[j]+=a[i][j],u+=a[i][j];
            sort(q+1,q+m+1,cmp);
            for(j=1;j<=c;j++)
                   u-=q[j];}
fprintf(g,"%d",u);
return 0;}