Four shepherds were watching over their flocks, and they were commenting on how many sheep they each had.

If Alex had three more sheep, then he'd have one fewer sheep than Billie.

Whereas Drew has the same number as the other three shepherds put together.

If Charlie had three fewer sheep, he'd have exactly three times the number of Alex.

If they were evenly distributed, they'd each have eleven sheep.

How many sheep does Alex have?