The sum of all the elements in the range of
$$
\begin{aligned}
& f(x)=\operatorname{Sgn}(\sin x)+\operatorname{Sgn}(\cos x)+\operatorname{Sgn}(\tan x)+\operatorname{Sgn}(\cot x), x \neq \frac{\mathrm{n} \pi}{2}, \mathrm{n} \in \mathrm{Z}, \\
& \text { where } \operatorname{Sgn}(\mathrm{t})=\left\{\begin{array}{cl}
1, & \text { if } \mathrm{t}>0 \\
-1, & \text { if } \mathrm{t}<0
\end{array},\right. \text { is : }
\end{aligned}
$$
