4 + 1 + 2 . .
15 . (4 + 4 + 4 + 1 + 2 . .) , .
1 .
, - .
= 4 . .
2- (.): . ., * 1 . ., 3 . ., 1- 2 , * 2 ., 1 . ., . .
3- (.): . ., 1 . ., * 1 . ., , 1 . ., 1 . ., *, . .
4- (.): . ., * 1 . ., 3 . ., * 2 ., 1 . ., . .
4 .