n<10</strong>
F(1)=F(4) + 1 + F(3)
F(3)= F(6) + 3 + F(9)
F(4)= F(7) +4
F(6)= F(9) + 6
F(7) = 7
F(9) =9
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F(6) =9 + 6
F(4) = 7+ 4
F(3) = 9 + 6 + 3 + 9
F(1) = 7 + 4 + 1 + 9 + 6 + 3 + 9
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ОТВЕТ 7419639