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Cod sursa(job #274530)
program flip;
var s,a,i,j,m,n:longint;
begin
s:=0;
assign(input,'flip.in');
reset(input);
read(input,n,m);
for i:=1 to n do
for j:=1 to m do begin
read(input,a);
if a<0 then a:=a*(-1);
s:=s+a;
end;
close(input);
assign(output,'flip.out');
rewrite(output);
write(output,s);
close(output);
end.