I feel Its Easy

Level pending

\[ 1, -1, 1, 2, -1, -2, 1, 2, 3, -1, -2, -3, 1, 2, 3, 4, -1, -2, -3, -4........ \]

\( \text{Find the sum of first 1000 terms of the above sequence} \)

Inspriration

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