var f,g:text;
    a:array[1..16,1..16] of longint;   
    s,ss,smax,hhh:longint;   
    k,i,j,n,m:byte;   
    x:array[0..16] of byte;   
begin
assign(f,'flip.in');RESET(F);
assign(g,'flip.out');REWRITE(G);
rewrite(g);
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;
k:=1;
while k>0 do begin
if x[k]<2 then x[k]:=x[k]+1;
if k=n then
begin
ss:=0;
for j:=1 to m do
begin
s:=0;
for i:=1 to n do
begin
if x[i]=2 then
s:=s-a[i,j]
else
s:=s+a[i,j];
end;
if s<0 then ss:=ss-s
else ss:=ss+s;
end;
if ss>smax then smax:=ss;
while x[k]=2 do
begin
k:=k-1;
end;
end
else
begin
k:=k+1;
x[k]:=0;
end
end;
write(g,smax+1);
close(f);
close(g);
end.