program jasd;
var f,g:text;
n,m,s,s1,s2,aux,x:int64;
i,j:longint;
a:array[1..16,1..16] of longint;
begin
assign(f,'flip.in');reset(f);
assign(g,'flip.out');rewrite(g);
read(f,n,m);
for i:=1 to n do begin
  for j:=1 to m do begin
  read(f,x);
  a[i,j]:=x;
  end;
  readln(f);
end;
s:=0;
for i:=1 to n do begin
s1:=0;s2:=0;
   for j:=1 to m do begin
   s1:=s1+a[i,j];
   s2:=s2+(-1)*a[i,j];
   end;
   if s1>s2 then s:=s+s1
   else s:=s+s2;
end;
aux:=s;
s:=0;
for j:=1 to m do begin
s1:=0;s2:=0;
  for i:=1 to n do begin
  s1:=s1+a[i,j];
  s2:=s2+(-1)*a[i,j];
  end;
  if s1>s2 then s:=s+s1
  else s:=s+s2;
end;
if s>aux then write(g,s)
else write(g,aux);
close(f);close(g);
end.