Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_18950885_3 (used__kb_ INTEGER, graphics_mode VARCHAR)
### Question:
What is the used (kb) when the graphics mode is 4?
### Answer:
SELECT MIN(used__kb_) FROM table_18950885_3 WHERE graphics_mode = 4