- , ,
( )
. " "
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
( )
- . (+2)- (+4)
4-6, - ( =0)
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
( )