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_38 (round INTEGER, position VARCHAR, pick__number VARCHAR)
### Question:
What is the sum of the round of the player who plays linebacker and has a pick # greater than 251?
### Answer:
SELECT SUM(round) FROM table_name_38 WHERE position = "linebacker" AND pick__number > 251