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_name_35 (sample_size INTEGER, date_s__administered VARCHAR)
### Question:
What is the highest sample size administered on October 18?
### Answer:
SELECT MAX(sample_size) FROM table_name_35 WHERE date_s__administered = "october 18"