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_23 (tonnage_grt INTEGER, type VARCHAR, nationality VARCHAR)
### Question:
What is the total Tonnage GRT with a Type of cargo ship, and a Nationality of norway?
### Answer:
SELECT SUM(tonnage_grt) FROM table_name_23 WHERE type = "cargo ship" AND nationality = "norway"