How to wire up LED lights using a 12v source. How many and how do you wire them up?

I am planning on wiring around (16) 3mm red led lights up to my xbox using the xbox's 12v source. How many LEDs can I use if they are 3.5v per LED? Can I string them all on one strand with a source of 12v or do I have to have multiple 12v sources? Please explain how I would wire them up.
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