0/1 1/1
2/1 3/1
4/1 5/1
6/1 7/1
8/1 9/1
10/1 11/1
12/1 13/1
14/1 15/1
16/1 17/1
18/1 19/1
20/1 21/1
22/1 23/1
24/1 25/1
26/1 27/1
2870796/100000 2970796/100000