Question: How do I find a matrix's nilpotent index?

Hi,

 

I have the following matrix and I have to find it's nilpotent index...

0 0 0 0 0

6 0 0 0 0

0 2 0 0 0

0 0 8 0 0

0 0 0 3 0

I've tried various things like assigning the matrix to variable A then do a solve(A^X = 0) but I only get "warning solutions may have been lost"

Thanks for any help!

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