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Untuk setiap bilangan asli n, misalkan S(n) menyatakan hasil jumlah digit-digit n dalam penulisan desimal. Sebagai contoh, S(2016) = 2 + 0 + 1 + 6 = 9. Hasil jumlah semua bilangan asli n sehingga n + S(n) = 2016 adalah ....

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