+-----+---------+---------+--------+
| key | wallsId | floorId | roofId |
+-----+---------+---------+--------+
| 701 |    1    |    3    |    2   |
+-----+---------+---------+--------+
| 702 |    1    |    3    |    1   |
+-----+---------+---------+--------+
| 703 |    2    |    1    |    3   |
+-----+---------+---------+--------+

+-------+-------+-------+------+
| value | walls | floor | roof |
+-------+-------+-------+------+
|   1   |  4,8  |  5,4  |  3,6 |
+-------+-------+-------+------+
|   2   |  7,5  |  3,8  |  7,8 |
+-------+-------+-------+------+
|   3   |  3,6  |  10,1 |  4,1 |
+-------+-------+-------+------+

+-----+-------------+
| key | final_value |
+-----+-------------+
| 701 |     22,7    |
+-----+-------------+
| 702 |     12,2    |
+-----+-------------+
| 703 |      17     |
+-----+-------------+