I really want you (developers) to add a chip with 3 inputs and 2 outputs and call it (Full-Adder) .. This is the circuit
And this is the truth table up to down
In1 | In2 | In3 | Out1 | Out2
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0 | 0 | 1 | 0 | 1
0 | 1 | 0 | 0 | 1
1 | 0 | 0 | 0 | 1
0 | 1 | 1 | 1 | 0
1 | 0 | 1 | 1 | 0
1 | 1 | 0 | 1 | 0
1 | 1 | 1 | 1 | 1
OR
Just increase the work space for us