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_2857352_3 (network VARCHAR, virtual_channel VARCHAR)
### Question:
How many networks run on virtual channel 23.4?
### Answer:
SELECT COUNT(network) FROM table_2857352_3 WHERE virtual_channel = "23.4"