x y
 1 0
 2 0
 3 0
 4 0
 5 0
 6 0
 7 0
 8 0
 9 0
10 0
11 0
12 0
13 0
14 1
15 0
16 0
17 0
18 1
19 1
20 1
21 0
22 1
23 0
24 1
25 1
26 1
27 1
28 1
29 1
30 1