#a
1	0
2	1
3	0
4	0
5	0
6	1
7	0
8	1
9	1
10	1
11	0
12	0
13	0
14	1
15	1
16	1
17	1
18	1
19	0
20	0
21	0
#b
1	0
2	1
3	0
4	0
5	0
6	1
7	0
8	1
9	1
10	1
11	0
12	1
13	1
14	1
15	1
16	1
17	1
18	1
19	0
20	0
21	0