N= 25  f= 17.966667
1   0
2   1
3   0
4   1
5   1
6   0
7   1
8   1
9   1
10   0
11   0
12   0
13   0
14   0
15   0
16   1
17   0
18   0
19   0
20   0
21   0
22   1
23   0
24   0
25   1