Summation inside a summation inside a summation

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The discussion revolves around the confusion of performing a summation nested within another summation. The user initially struggles with understanding how to approach the problem and seeks clarification on the steps involved. They consider using brackets to simplify the process but are unsure about the variables K and J. After some trial and error, they realize their mistake in calculating the expression and confirm the correct interpretation leads to the answer of 81. Ultimately, they clarify their understanding of the expression's structure, distinguishing between different interpretations.
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I know how to do it normally, but this confuses me. Can you show me how to do it? And what were the steps you took... etc. Initially, I thought of putting them inside brtackets and work out the last one at the right first, but I'd need to know what K and J are, it's confusing. Can anyone make this clear for me?
EDIT:
IMG_20120915_222841.jpg


I tried this, but it doesn't seem like I'm on the right track.
 
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But I also solved it with a calculator and it says the answer is 81. What am I doing wrong?
 
Nevermind. I figured it out. :D

IMG_20120915_232603.jpg
 
1-1+1 = 1 not -1 ... that's if you mean i - j + k and not i - (j + k) .
 

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