Simple Calculator

Simple calculator.

Numbers are represented by the number of active wires (unlike in a binary system where each wire has a corresponding power-of-2 value). Stages work as follows:

Purple - translates input from levers into corresponding number of active wires (i.e. if top lever 4 and bottom lever 2 are pushed down, then Green stage will receive as input 6 active wires).

Green - shuffle inputs so they are next to each other (i.e. so there are no inactive wires between the 6 wires coming in as input)

Blue - translates the numer of input wires into a single wire (i.e. 6 active input wires means that only 6th blue output wire will be active)

Orange - translate input (i.e. 6th wire active) into 7-segment-display