user: Question: How many members arrived on the main island in week 4?
Columns: ['Member', 'Week Arrived On Main Island', 'Week Sent To Third Island', 'Original Tribe', 'Tribe They Chose To Win']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Member', 'Week Arrived On Main Island', 'Week Sent To Third Island', 'Original Tribe', 'Tribe They Chose To Win']
SQL:

assistant: SELECT COUNT("Member") FROM "Table" WHERE "Week Arrived On Main Island" = '4';