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

### Instruction:
What is the sum of # Of Candidates, when # of Constituency Votes is less than 25,643,309, when Leader is Masayoshi Ōhira, and when Election is before 1979?

### Inputs:
table_name: table, columns: ['Election', 'Leader', '# of candidates', '# of Constituency votes', '% of Constituency vote']

### Response:
SELECT SUM # of candidates FROM table WHERE # of Constituency votes < 25,643,309 AND Leader = masayoshi ōhira AND Election < 1979