N= 25  f= 17.537143
1   0
2   0
3   0
4   0
5   0
6   0
7   0
8   0
9   0
10   0
11   0
12   1
13   0
14   1
15   1
16   0
17   0
18   0
19   1
20   0
21   1
22   1
23   0
24   0
25   1