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Cod sursa(job #110859)
program flip;
var v:array [1..100] of integer;
f,g:text;
i,j,n,m,x:integer;
s:longint;
begin
assign(f,'flip.in');
assign(g,'flip.out');
reset(f);
rewrite(g);
read(f,n);
read(f,m);
x:=1;
for i:=1 to n do
for j:=1 to m do
begin
read(f,v[x]);
x:= x+1;
end;
s:=0;
for i:=1 to x do
begin
if v[i] > 0 then
s:= s + v[i];
end;
write(g,s);
close(f);
close(g);
end.