-1-2-3-.-1000=

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-1-2-3-.-1000=-1-2-3-.-1000=-1-2-3-.-1000==-(1+2+3...+1000)=-[(1+1000)+(2+999)...+(500+501)]=-1001*5

-1-2-3-.-1000=
-1-2-3-.-1000=

-1-2-3-.-1000=
= - (1+2+3...+1000)
= - [(1+1000)+(2+999)...+(500+501)]
= - 1001*500
= - 500500