1997 minus half of it, and then minus the remaining one-third, until minus the remaining 1978, what's the final number? Reason + process = best answer

1997×（1-1/2）×（1-1/3）×…… ×（1-1/1978）
=1997×1/2×2/3×…… ×1977/1978
=1997×1/1978
=1997/1978

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