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_21 (round VARCHAR, pick VARCHAR, position VARCHAR)
### Question:
What is the total number of rounds of the end player with a pick number greater than 303?
### Answer:
SELECT COUNT(round) FROM table_name_21 WHERE pick > 303 AND position = "end"