# Sum,Sum,Sum,Sum....

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Assume $$N$$ such that the value of $$N$$ is as follows: $\sum_{a_{60}=0}^2\sum_{a_{59}=0}^{a_{60}}\sum_{a_{58}=0}^{a_{59}}.....\sum_{a_{2}=0}^{a_{3}}\sum_{a_{1}=0}^{a_{2}}\sum_{a_{0}=0}^{a_{1}}1$

What are the 3 last digits of $$N$$?

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