$$(-4)-(-13)-(-1000)-(-999)=$$
$2008$
$$-4+13-\left(-1000\right)-\left(-999\right)$$
$$9-\left(-1000\right)-\left(-999\right)$$
$$9+1000-\left(-999\right)$$
$$1009-\left(-999\right)$$
$$1009+999$$
$$2008$$
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$2^{3}\times 251$