3
2
1
1
4
3
2
2
8
2
1
1
9
2
1
1
12
2
1
1
15
2
1
1
16
2
1
1
17
2
1
1
20
2
1
1
21
2
1
1
22
2
1
1
23
2
1
1
24
2
1
1
