!
!

 


>> 11 .

6.

 

,

6.3.

, 3:

    21[3] → 16[3] → 11[3] → 6[3] → 1[3] 3.

N = 25. :

    25[3] → 20[3] → 15[3] → 10[3] → 5[3] → 1[2]2[3] 233.

, 3, , .

, , 22, 23 24 3.

, N 3, :

    1) N mod 5 = 0, N := 5, N := N mod 5;

    2) , N 3.

, , 2017, 12 345 3.

, , 2015, 12 347 2.

5. , , - 2.9.

, X, , , S . , 2.9.

, X , 3. X, .

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