Full 4 bits adder with the first 4 bits number under the 6, the second under the 7, the result above the 9. (only counting violet y when you have the maximum of them and when they're all above a 9).
This is preconfigured with 1111+0001 witch give 10000 witch is why the W is there. This system work for any numbers but you can get stuck if you're dumb.
Don't forget to move the W if you want to test others numbers. Feel free to try making a full 5 bits adder.
00B6B7BB6B7BB6B7BB6B7BBBBBBBBBB00BYB0BBYB0BBYB0BBYBY50000000VB00BGBGBBGBGBBGBGBBGBGBBBBBBBB0B00BGGG4BGGG4BGGG4BGGGVO0000VB0B000BVBL0BVBL0BVBL0BBBL0BBBB0B0B000BL0B0BL0B0BL0B0000BB00010B0B0000BOB00BOB00BO0BBB0000BOB0B0B0000B00B0B00B00B0000BBBBB0B0B0B00000B0O00B00B00BBB000000VB0B0BFULL0B00B00B00B0000BBBBBB0B0B0B000000B00B00B00BBB00000010B0B0B40BITS0B00B00B0000BBBBBOB0B0B0B00000000B00B00BBB000000VB0B0B0BADDER0000B00B0000BBBBBB0B0B0B0B0000000000B00BBB00000010B0B0BVB00000000000B000WBBBBBBB0B0B0B0B000000000000BBB9BBBBBBB9B9B9B9B