1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 [9, 17]
9 1
10 [9, 17]
10 1
11 [11, 18]
11 [11, 12]
11 [9, 17]
11 3
12 [11, 18]
12 [11, 12]
12 [9, 17]
12 3
13 [11, 18]
13 [9, 17]
13 [13, 13]
13 3
14 [11, 18]
14 [9, 17]
14 2
15 [11, 18]
15 [15, 17]
15 [9, 17]
15 3
16 [11, 18]
16 [15, 17]
16 [9, 17]
16 3
17 [11, 18]
17 [15, 17]
17 [9, 17]
17 3
3