n,sec
1,0
2,1
3,10
4,100
5,1000
6,10000
7,100000
8,1000000
9,10000000
10,100000000
11,1000000000
12,1432036180
13,1500000000
14,2000000000
15,2000000000.
16,2000000000.0
17,2000000000.00
18,2000000000.123400
19,2000000000.123456
20,2000000000.999
21,2000000000.999999
22,2000000000.999999999
23,
24,x
25,123x