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

### Instruction:
on 19 april 1985 how many of number last flew

### Inputs:
table_name: table, columns: ['Number', 'Registration', 'First flew', 'Last flew', 'Flying hours', 'Location']

### Response:
SELECT COUNT Number FROM table WHERE Last flew = 19 April 1985