user: Question:  how many first elected with district is Kansas 3
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Kansas 1', 'William P. Lambertson', 'Republican', 1928.0, 'Re-elected', 'William P. Lambertson (R) Unopposed']
SQL:

assistant: SELECT COUNT("First elected") FROM "Table" WHERE "District" = 'Kansas 3';