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How do you find out the coordination number of a crystal?

For example im given a picture of the crystal structure of lithium sulfide Li2S.

SO i need to find coordination number for:

Li^+
S^2-

lithium i got right is 4 but the sulfide it says when counting sulfide: keeping in mind that another unit cell will be present above this one, so 4 for sulfide is wrong

lolz, you must a chma11 student at utsc. you are doing a great job for other 799 kids taking this course. keep it up. lol me stuck on the same question.

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