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:
| Week | Date | Opponent | Result | Game site | Record | Attendance |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | September 8, 1985 | at Cincinnati Bengals | W 28-24 | Riverfront Stadium | 1-0 | 51625.0 |
| 2.0 | September 15, 1985 | at San Diego Chargers | W 49-35 | Jack Murphy Stadium | 2-0 | 54420.0 |
| 3.0 | September 23, 1985 | Los Angeles Rams | L 24-35 | Kingdome | 2-1 | 63292.0 |
| 4.0 | September 29, 1985 | at Kansas City Chiefs | L 7-28 | Arrowhead Stadium | 2-2 | 50485.0 |
| 5.0 | October 6, 1985 | San Diego Chargers | W 26-21 | Kingdome | 3-2 | 61300.0 |
| 6.0 | October 13, 1985 | Atlanta Falcons | W 30-26 | Kingdome | 4-2 | 60430.0 |
| 7.0 | October 20, 1985 | at Denver Broncos | L 10-13 OT | Mile High Stadium | 4-3 | 74899.0 |
| 8.0 | October 27, 1985 | at New York Jets | L 14-17 | The Meadowlands | 4-4 | 69320.0 |
| 9.0 | November 3, 1985 | Los Angeles Raiders | W 33-3 | Kingdome | 5-4 | 64060.0 |
| 10.0 | November 10, 1985 | at New Orleans Saints | W 27-3 | Louisiana Superdome | 6-4 | 47365.0 |
| 11.0 | November 17, 1985 | New England Patriots | L 13-20 | Kingdome | 6-5 | 60345.0 |
| 12.0 | November 25, 1985 | at San Francisco 49ers | L 6-19 | Candlestick Park | 6-6 | 57482.0 |
| 13.0 | December 1, 1985 | Kansas City Chiefs | W 24-6 | Kingdome | 7-6 | 52655.0 |
| 14.0 | December 8, 1985 | Cleveland Browns | W 31-13 | Kingdome | 8-6 | 58477.0 |
| 15.0 | December 15, 1985 | at Los Angeles Raiders | L 3-13 | Los Angeles Memorial Coliseum | 8-7 | 77425.0 |
Question:
Name the number of opponent with arrowhead stadium
Answer:
1.0