Let $f(x)=\left\lfloor(x-1)\left(x^2-2 x-3\right)\right\rfloor+x-3, x \in R$. If $m$ and $M$ are respectively the number of points of local minimum and local maximum of $f$ in the interval $(0,4)$, then $m+M$ is equal to $\_\_\_\_$
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