program dalai_lama;
var f,g:text;
    a:array[1..16,1..16] of longint;
    s1,s2:array[1..16] of longint;
    s:longint;
    i,j,n,m:integer;
begin
assign(f,'flip.in');
assign(g,'flip.out');
reset(f);
rewrite(g);
read(f,n);
read(f,m);
s:=0;
for i:=1 to n do
for j:=1 to m do read(f,a[i,j]);

for j:=1 to m do s2[j]:=0;
for i:=1 to n do begin
                 s1[i]:=0;
                 for j:=1 to m do begin
                 s1[i]:=s1[i]+a[i,j];
                 s2[j]:=s2[j]+a[i,j];
                 end;
                 end;

for i:=1 to n do if s1[i]<0 then begin
                                 s1[i]:=-s1[i];
                                 for j:=1 to m do s2[j]:=s2[j]-(a[i,j]*2);
                                 end
                            else s1[i]:=s1[i];

for j:=1 to m do if s2[j]<0 then begin
                                 s2[j]:=-s2[j];
                                 for i:=1 to n do s1[i]:=s1[i]-(a[i,j]*2);
                                 end
                            else s2[j]:=s2[j];

for i:=1 to n do s:=s+s1[i];
write(g,s);

close(f);
close(g);
end.