Two functions $f : R \to R, g : R \to R$ are defined as follows:
$f (x) = \{\begin{cases} 0 (x r a t i o n a l) \\ 1 (x i r r a t i o n a l) \end{cases} \begin{matrix} \end{matrix}, g (x) = \{\begin{cases} - 1 (x r a t i o n a l) \\ 0 (x i r r a t i o n a l) \end{cases} \begin{matrix} \end{matrix}$ then $| (f o g) (π) + (g o f) (e) | =$

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