program elimin;
  const
    fin='elimin.in';
    fout='elimin.out';
  type
    matr=array[1..20,1..5000] of longint;
  var
    a,b:matr;
    smax,s:longint;
    st:array[0..20] of longint;
    total:longint;
    ss,col:array[1..5000] of longint;
    m,n,r,c,i,j,k:longint;

procedure qsort(lo,hi:integer);
    procedure sort(l,r:integer);
      var
        i,j,x:longint;
      begin
        i:=l;j:=r;x:=ss[(l+r) shr 1];
        repeat
          while ss[i]<x do
            inc(i);
          while ss[j]>x do
            dec(j);
          if i<=j then
            begin
              ss[j]:=ss[i] xor ss[j];
              ss[i]:=ss[i] xor ss[j];
              ss[j]:=ss[i] xor ss[j];
              dec(j);inc(i);
            end;
        until i>j;
        if j>l then
          qsort(l,j);
        if r>i then
          qsort(i,r);
      end;
  begin
    sort(lo,hi);
  end;

procedure scufunda(i,n:longint);
  var
    p:longint;
  begin
    p:=i;
    if i shl 1<=n then
      if ss[i shl 1]>=ss[p] then
        p:=i shl 1;
    if i shl 1 or 1<=n then
      if ss[i shl 1 or 1]>=ss[p] then
        p:=i shl 1 or 1;
    if p<>i then
      begin
        ss[p]:=ss[p] xor ss[i];
        ss[i]:=ss[p] xor ss[i];
        ss[p]:=ss[p] xor ss[i];
        scufunda(p,n);
      end;
  end;

procedure hsort;
  var
    i:longint;
  begin
    for i:=n shr 1 downto 1 do
      scufunda(i,n);
    for i:=n downto 2 do
      begin
        ss[1]:=ss[1] xor ss[i];
        ss[i]:=ss[1] xor ss[i];
        ss[1]:=ss[1] xor ss[i];
        scufunda(1,i-1);
      end;
  end;

function sum:longint;
  var
    i,j:longint;
    s:longint;
      begin
        s:=total;
        for i:=1 to n do
          ss[i]:=col[i];
        for i:=1 to n do
          for j:=1 to r do
            begin
              dec(ss[i],a[st[j],i]);
              dec(s,a[st[j],i]);
            end;
        qsort(1,n);
        for i:=1 to c do
          dec(s,ss[i]);
        sum:=s;
      end;

procedure back(x:longint);
  var
    i:longint;
    begin
      if x=r+1 then
        begin
          s:=sum;
          if s>smax then
            smax:=s;
        end
      else
        begin
          for i:=st[x-1]+1 to m do
            begin
              st[x]:=i;
              back(x+1);
              st[x]:=0;
            end;
        end;
    end;

begin
  assign(input,fin);
    reset(input);
    readln(m,n,r,c);
    st[0]:=0;
    if m>15 then
      begin
        for i:=1 to m do
          for j:=1 to n do
            read(a[j,i]);
        m:=m xor n;
        n:=m xor n;
        m:=m xor n;
        r:=r xor c;
        c:=r xor c;
        r:=r xor c;
      end
    else
      begin
        for i:=1 to m do
          for j:=1 to n do
            read(a[i,j]);
      end;
    total:=0;
    for j:=1 to n do
      for i:=1 to m do
        begin
          inc(total,a[i,j]);
          inc(col[j],a[i,j]);
        end;
  close(input);
  assign(output,fout);
    rewrite(output);
    smax:=0;
    back(1);
    writeln(smax);
  close(output);
end.