var a: integer;
begin
read(a);
if (a mod 2 = 0) and (a > 10) and (a < 20) then writeln(a * 2);
end.
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Answers & Comments
var a: integer;
begin
read(a);
if (a mod 2 = 0) and (a > 10) and (a < 20) then writeln(a * 2);
end.