var
n: Word;
s: string;
begin
Read (n);
Str (n, s);
if n < 100 then
s := '00' + n;
if (n >= 100) and (n < 1000) then
s := '0' + n;
if (s[1] = s[4]) and (s[2] = s[3]) then
Write (1)
else
Write (Random (1000) + 2)
end.
Str - процедура перевода числа n в строку s