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 | Type | Circle | Bench | Formed | Notes |
| --- | --- | --- | --- | --- | --- |
| Überlingen | Imperial City | Swab | SW | 1268 | 1803: Mediatized to Baden |
| Ulm | 1155: Free Imperial City | Swab | SW | 1115 | 1803: Mediatized to Bavaria\n1809: To Wurttemberg |
| Umpfenbach | Lordship\n1805: HRE Princely County |  |  |  | To Trauttmansdorff |
| Unterwalden | Imperial valley |  |  | 1415 | Division into Nidwalden and Obwalden\n1173: To Counts of Habsburg\n1291: Nidwalden became a founding member of the Swiss League\n1324: Immediate Imperial fief (Reichsunmittelbar)\n1350s: Division into Obwalden and Nidwalden\n1648: Left Empire as member of Swiss Confederation |
| Upper Salm | 1163: County |  |  | 1170 | Partitioned from Salm\n1499: Raised to Wild- and Rhinegraves of Salm\n1574: Divided into Salm-Salm and Salm-Grumbach |
| Upper Bavaria (Oberbayern) | Duchy |  |  | 1255 |  |
| Upper Schönburg | County | Upp Sax |  | 1569 | Partitioned from Schönburg\n1800: Partitioned into Schönburg-Hartenstein and Schönburg-Waldenburg |
| Urach | County |  |  |  | 1060: 1st mention of Urach\n1080: 1st use of "Count of Urach"\nDivision of territory into Achalm and Urach\n1218 Egino I of Urach inherited County of Freiburg from Zahringen\n1261: Counts of Urach died out\n1251-1265: Ulrich I of Wurttemberg acquired territories of Counts of Urach |
| Uri | Imperial valley |  |  | 1231 | Split off from Habsburg\n1648: Left Empire as member of Swiss Confederation |
| Ursberg | 1143: HRE Abbey | Swab |  |  | 1803; Secularized |
| Utrecht | Bishopric | Burg | EC | 1024 | 1512: Burgundian Circle\n1528: Secularized to Austria\n1793: Council of Princes |
| Uznach | County |  |  |  |  |
Question:
what is the number of the states in the holy roman empire that begin with the letter u?
Answer:
12