(1994+1992+1990...4+2)-(1+3+5+...+1993)

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(1994+1992+1990...4+2)-(1+3+5+...+1993)
(1994+1992+1990...4+2)-(1+3+5+...+1993)

(1994+1992+1990...4+2)-(1+3+5+...+1993)
(1994+1992+1990...4+2)-(1+3+5+...+1993)
=1+1+...+1
=997