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:
| Player | Tries | Conv | Pens | Drop | Venue | Date |
| --- | --- | --- | --- | --- | --- | --- |
| Chris O'Brien | 3 | 7 | 0 | 0 | Montevideo | 05/11/1989 |
| Mike Hercus | 1 | 3 | 4 | 1 | Tokyo | 30/05/2004 |
| Mike Hercus | 0 | 13 | 0 | 0 | Santa Clara | 01/07/2006 |
| Chris O'Brien | 2 | 6 | 1 | 0 | Hamilton | 12/03/1994 |
| Matt Alexander | 1 | 8 | 1 | 0 | San Francisco | 06/07/1996 |
| Matt Alexander | 1 | 4 | 3 | 0 | San Francisco | 29/06/1996 |
| Mike Hercus | 0 | 5 | 4 | 0 | Madrid | 12/04/2003 |
| 5 players on 20 points | 5 players on 20 points | 5 players on 20 points | 5 players on 20 points | 5 players on 20 points | 5 players on 20 points | 5 players on 20 points |
Question:
Which pens has 1 tries and matt alexander as a player with conv of 4?
Answer:
3.0