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:
| District | Incumbent | Party | First elected | Result | Candidates |
| --- | --- | --- | --- | --- | --- |
| California 1 | Clarence F. Lea | Democratic | 1916.0 | Re-elected | Clarence F. Lea (D) (unopposed) |
| California 2 | John E. Raker | Democratic | 1910.0 | Re-elected | John E. Raker (D) (unopposed) |
| California 4 | Julius Kahn | Republican | 1898.0 | Re-elected | Julius Kahn (R) 86.6% William Short (S) 13.4% |
| California 5 | John I. Nolan | Republican | 1912.0 | Re-elected | John I. Nolan (R) 87% Thomas F. Feeley (S) 13% |
| California 6 | John A. Elston | Progressive | 1912.0 | Re-elected as Republican Republican gain | John A. Elston (R) 88.4% Luella Twining (S) 11.6% |
| California 7 | Denver S. Church | Democratic | 1912.0 | Retired Republican gain | Henry E. Barbour (R) 52.1% Henry Hawson (D) 47.9% |
Question:
Which District was the incumbent Julius Kahn from?  Answer:  California 4th district
Answer:
1.0