解法

下列数据不完全准确，仅供参考
Level 1:4
Level 2:10
Level 3:13
Level 4:5
Level 5:7
Level 6:9
Level 7:10
Level 8:5
Level 9:13
Level 10:8
Level 11:16
Level 12:2
Level 13:14
Level 14:20
Level 15:9
Level 16:7
Level 17:8
L