The functions $f : R \to R, g : R \to R$ are defined as
$\begin{array}{l} f (x) = \{\begin{matrix} \begin{array}{l} 0 \\ 1 \end{array} & \begin{array}{l} w h e n x i s r a t i o n a l \\ w h e n x i s i r r a t i o n a l \end{array} \end{matrix} \\ g (x) = \{\begin{matrix} \begin{array}{l} - 1 \\ 0 \end{array} & \begin{array}{l} w h e n x i s r a t i o n a l \\ w h e n x i s i r r a t i o n a l \end{array} \end{matrix} \end{array}$
then $(f o g) (π) + (g o f) (e) =$ _______

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