Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
how many dbeingtrict with candidates being william b. bankhead (d) 71.3% e. m. reed (r) 28.7%

### Inputs:
table_name: table, columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']

### Response:
SELECT COUNT District FROM table WHERE Candidates = William B. Bankhead (D) 71.3% E. M. Reed (R) 28.7%