Arcmap ModelBuilder – If statement

I’m using the ModelBuilder inside ArcMap to execute a set of raster calculations. I need to execute a different calculations based on the pixel value (If the pixel value is less then 0 – execute calculation no.2, If above 0 – execute calculation no.3).
Of course in the same raster can be both cases, so I need it to indeed chech every pixel and execute the appropiate following calculation per pixel.

Any idea how to do such thing ?