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_23050383_1 (kei VARCHAR, economic_incentive_regime VARCHAR)
### Question:
How many KEI catagories are listed when the economic incentive regime is 2.56? 
### Answer:
SELECT COUNT(kei) FROM table_23050383_1 WHERE economic_incentive_regime = "2.56"