>> 11 .

9.

 

,

9.3.

, 20, . , n < 20 (n) = 0.

20 1: , . : (n) = 1 n = 20.

n > 20 n - 1, n - 2 n - 4 , 1, 2 4 . n-1, n-2 n-4 n. , (n) = (n - 1) + (n - 2) + (n - 4).

, ():

    (n) = 0 n < 20;

    (n) = 1 n = 20;

    (n) = (n - 1) + (n - 2) + (n - 4) n > 20.

20 30:

, 169 , 20 30.

, , . . .

1. , .

2. , , . , , .

3. . , . .

4. . . , , . , . .

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