#include <stdio.h>
#include <iostream>

FILE *in = fopen("elimin.in","r"), *out = fopen("elimin.out","w");

int n, m, r, c;
int a[600][600];
int st[600];

int ss = 0;

int poz(int p, int u, int b[])
{
	int s=p, d=u, x=b[p];
	while ( s < d )
	{
		while ( b[d] >= x && s < d )
			--d;
		b[s] = b[d];
		while ( b[s] <= x && s < d )
			++s;
		b[d] = b[s];
	}
	b[s] = x;
	return s;
}

void qs(int p, int u, int b[])
{
	int m = poz(p, u, b);
	if ( p < m )
		qs(p, m-1, b);
	if ( m < u )
		qs(m+1, u, b);
}

void read()
{
    fscanf(in, "%d %d %d %d", &m, &n, &r, &c);

    for ( int i = 1; i <= m; ++i )
        for ( int j = 1; j <= n; ++j )
            fscanf(in, "%d" , &a[i][j]);
}

void suma()
{
    int t = 0;
    int b[600] = {0};

    int k=1;
/*
    for ( int i = 1; i <= c; ++i )
     printf("%d ",st[i]);

     printf("\n");
     */

    for ( int i = 1; i <= m; ++i )
        for ( int j = 1; j <= n; ++j )
        {
            while(st[k]<j && k<c) k++;
            if(st[k]!=j)
                b[i] += a[i][j];
        }

    qs(1, m, b);

    for ( int i = r+1; i <= m; ++i )
        t += b[i];

    if ( t > ss )
        ss = t;


}


void back(int col)
{
    for ( int i = st[col-1]+1; i <= n; ++i )
    {
        st[col] = i;
        if ( col == c )
        {
            suma();
        }
        else
            back(col+1);
    }
}

int main()
{
    read();
    back(1);


    fprintf(out, "%d\n", ss);

	return 0;
}