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var n : longint; function g(

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var
  n : longint;
function g(k : longint) : longint;
begin
  if k <= 1 then g := k
  else g := (2002 * g(k - 1) + 2003 * g(k - 2)) mod 2005;
end;
begin
  read(n);
  writeln(g(n));
end.
输入:2005
输出:1

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