0 = 0
0 = 0
1 = 1
2 = 2
3 = 3
4 = 4
5 = 5
6 = 6
7 = 7
8 = 8
9 = 9
0-2 = undefined
3 = 0
4-5 = undefined
6 = 1
7-8 = undefined
9 = 2
10-11 = undefined
12 = 3
13-14 = undefined
15 = 4
16-17 = undefined
18 = 5
19-20 = undefined
21 = 6
22-23 = undefined
24 = 7
25-26 = undefined
27 = 8
28-29 = undefined
30 = 9
0-9999 = undefined
10000 = 1
0-299999 = undefined
300000 = 1
0-2999999 = undefined
3000000 = 1