#include <stdio.h>
#define nmax 31
#define mmax 7296
int p,q,max=0,i,j,k,n,m,r,c,nr,co;
int a[nmax][mmax];
int fol[nmax],s[mmax];
int main()
{

	freopen("elimin.in","r",stdin);
	freopen("elimin.out","w",stdout);

	scanf("%d%d%d%d",&n,&m,&r,&c);
    if (n<=m)
	for (i=1; i<=n; i++)
		for (j=1; j<=m; j++)
			scanf("%d",&a[i][j]);
    else
    {
        k=n;n=m;m=k;    
        p=1;q=0;
        for (i=1; i<=n; i++)
            for (j=1; j<=n; j++)
            {
                if (q<m) q++;
                else { p++;q=0;}
                scanf("%d",&a[p][q]);    
            }
    }

	   for (k=0; k<=(1<<n)-1; k++)
	   {
		   for (i=1; i<=n; i++)
			   fol[i]=0;

		   nr=0;co=k;
		   while (co>0)
		   {
			   nr+=co%2;co=co/2;
		   }
		   if (nr==r)
		   {
			   for (i=1; i<=m; i++)
				  s[i]=0;
			   co=k;i=0;
			   while (co>0)
			   {
				  i++;
				  fol[i]=co%2;co=co/2;
			   }

			   for (j=1; j<=m; j++)
			   {
				   s[i]=0;
				   for (i=1; i<=n; i++)
						if (fol[i]==0) s[j]+=a[i][j];
			   }
			   for (i=1; i<=m-1; i++)
				   for (j=i+1; j<=m; j++)
					  if (s[i]>s[j])
					  {
						int x=s[i];
						s[i]=s[j];
						s[j]=x;
					  }
			   int sum=0;
			   for (i=c+1; i<=m; i++)
					sum+=s[i];
			   if (sum>max) max=sum;
		   }
	   }

	printf("%d\n",max);
        
    
    
    return 0;    
}