Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is Userpics Free, when Monthly Cost For Paid Account is "unknown", and when S Registered User is 2340?

### Inputs:
table_name: table, columns: ['Name', 'Year Began', 's Registered user', 'Updated in past 30 days', 'Registration', 'Ability to syndicate off-site feeds', 'Userpics Free', 'Userpics Paid', 'Monthly Cost for Paid Account', 'Yearly Cost for Paid Account', 'Permanent Account']

### Response:
SELECT Userpics Free FROM table WHERE Monthly Cost for Paid Account = unknown AND s Registered user = 2340