Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Name | Level | Digits | Average size (square miles) | Number of HUs (approximate) | Example name | Example code (HUC) |
| --- | --- | --- | --- | --- | --- | --- |
| Region | 1.0 | 2.0 | 177,560 | 21.0 | Pacific Northwest | 17.0 |
| Subregion | 2.0 | 4.0 | 16,800 | 222.0 | Lower Snake | 1706.0 |
| Basin | 3.0 | 6.0 | 10,596 | 370.0 | Lower Snake | 170601.0 |
| Subbasin | 4.0 | 8.0 | 700 | 2200.0 | Imnaha River | 17060102.0 |
| Watershed | 5.0 | 10.0 | 227 (40,000–250,000 acres) | 22000.0 | Upper Imnaha River | 1706010201.0 |
| Subwatershed | 6.0 | 12.0 | 40 (10,000–40,000 acres) | 160000.0 | South Fork Imnaha River | 170601020101.0 |
Question:
How many HUC example codes have 1 level?
Answer:
1.0