user: Question: How many people are guest 1 on episodes where guest 4 is Des Kelly?
Columns: ['Date', 'Presenter', 'Guest 1', 'Guest 2', 'Guest 3', 'Guest 4']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['5 September', 'Colin Murray', 'Greg Brady', 'Mark Watson', 'Des Kelly', 'Simon Jones (debut)']
SQL:

assistant: SELECT COUNT("Guest 1") FROM "Table" WHERE "Guest 4" = 'Des Kelly';