How many members arrived on the main island in week 4?
CREATE TABLE table_72226 (
    "Member" text,
    "Week Arrived On Main Island" text,
    "Week Sent To Third Island" text,
    "Original Tribe" text,
    "Tribe They Chose To Win" text
)
SELECT COUNT("Member") FROM table_72226 WHERE "Week Arrived On Main Island" = '4'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many members arrived on the main island in week 4? ### Input: CREATE TABLE table_72226 (
    "Member" text,
    "Week Arrived On Main Island" text,
    "Week Sent To Third Island" text,
    "Original Tribe" text,
    "Tribe They Chose To Win" text
) ### Response: SELECT COUNT("Member") FROM table_72226 WHERE "Week Arrived On Main Island" = '4'