# 180. Consecutive Numbers

+----+-----+
| Id | Num |
+----+-----+
| 1  |  1  |
| 2  |  1  |
| 3  |  1  |
| 4  |  2  |
| 5  |  1  |
| 6  |  2  |
| 7  |  2  |
+----+-----+


+-----------------+
| ConsecutiveNums |
+-----------------+
| 1               |
+-----------------+


# Solution

## Algorithm

IdNumIdNumIdNum
112131
>Note: The first two columns are from l1, then the next two are from l2, and the last two are from l3.