#include<cstdio>
#include<algorithm>
using namespace std;

const int MAX_N = 1001 ;
const int MAX_V = 31 ;

int m,n,r,c,solutia,suma;
int a[MAX_N][MAX_N];
int v[MAX_V],s[MAX_N];

void back(int x,int y)
{
	if(x == r+1)
	{
		for(int i=1;i<=n;++i)
			for(int j=1;j<=m;++j)
				s[j]+=a[i][j]*v[i];
		sort(s+1,s+m+1);
		for(int i=m;i>c;--i)
			suma+=s[i];
		if(suma > solutia)
			solutia = suma ;
		suma = 0 ;
		for(int i=1;i<=m;++i)
			s[i] = 0;
		return;
	}	
	for(int i=y+1;i<=n-r+x;++i)
	{
		v[i] = 0 ;
		back(x+1,i);
		v[i] = 1 ;
	}	
}

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(int i=1;i<=n;++i)
		{	
			for(int j=1;j<=m;++j)
				scanf("%d",&a[i][j]);
			v[i] = 1;
		}
	}	
	else
	{
		for(int i=1;i<=n;++i)
			for(int j=1;j<=m;++j)
				scanf("%d",&a[i][j]);
		swap(m,n);
		swap(r,c);
	}	
	back(1,0);
	printf("%d\n",solutia);
	return 0;
}