block os day
 1  1  0
 2  0  0
 3  1  0
 4  0  0
 5  0  0
 6  1  0
 7  1  0
 8  0  0
 9  0  0
10  0  0
11  1  1
12  1  1
13  1  1
14  0  1
15  0  1
16  1  1
17  1  1
18  0  1
19  1  1
20  0  1
