Program Flip;
type tab=array[1..16,1..16] of -1000000..1000000;
mult=-1..1;
fli = array[1..16] of mult;
var a:tab;
fl:fli;
f,g:text;
m,n,i,j:1..16;
s1,s2:longint;
function Solut(a:tab):longint;
var i,j:1..16;
s,sol:longint;
begin
sol:=0;
for i:=1 to m do begin
 s:=0;
 for j:=1 to n do begin
  s:=s+fl[i]*a[i,j];
 end;
sol:=sol+abs(s);
end;
solut:=sol;
end;
function backtrack(a:tab; k:byte; e:mult):longint;
var i:byte;
s,s1,s2:longint;
begin
s:=0;
 if k<=n then begin
  if k>0 then
  for i:=1 to m do
   s:= s + a[k,i]*e;
   s1:=backtrack(a,k+1,-1);
   s2:=backtrack(a,k+1,1);
   if s1>s2 then fl[k+1]:=-1 else fl[k+1]:=1;
  backtrack:=s;
  end else backtrack:=0;
end;
begin
assign(f,'flip.in');
assign(g,'flip.out');
reset(f);
rewrite(g);
n:=1;m:=1;
readln(f,n,m);
for i:=1 to n do begin
 for j:=1 to m do
  read(f,a[i,j]);
  readln(f);
  end;
s1:=backtrack(a,0,1);
writeln(g,solut(a));
close(f);
close(g);
end.