2097151
9
2 7
2 10
2 13
2 18
2 18
2 21
2 21
2 21
2 21
18
2 1
2 7
2 11
2 11
2 11
2 12
2 12
2 12
2 12
2 14
2 16
2 16
2 16
1 1
1 1
1 1
1 1
1 1
