{
TASK:N23
LANG:PASCAL
}
var n:integer;
begin
 readln(n);
 case n of
 1: writeln('2');
 2: writeln('32');
 3: writeln('32');
 4: writeln('32');
 5: writeln('32');
 6: writeln('23232');
 7: writeln('223232');
 8: writeln('223232');
 9: writeln('223232');
 10: writeln('223232');
 11: writeln('223232');
 else writeln('NO');
 end;
end.