IOIer
program dkjsg;
  const t = 80;
var
  a : integer;
  b : real;
begin
  read(a);
  if a >= 200 then b := t*a*0.85
  else if a >= 150 then b := t*a*0.88
  else if a >= 100 then b := t*a*0.9
  else b := t*a;
  writeln(b:0:2);
end.

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