Limits Continuity and Differentiability

Let ƒ : [–1,3] $$\to$$ R be defined as f(x) = \left\{ {\matrix{ {\left| x \right| + \left[ x \right]} & , & { - 1 \le x < 1} \cr {x + \left| x \right|} & , & {1 \le x < 2} \cr {x + \left[ x \right]} & , & {2 \le x \le 3} \cr } } \right. where [t] denotes the greatest integer less than or equal to t. Then, ƒ is discontinuous at: