50
1 2 3
4 0 0
87 4 5
21 0 0
28 6 7
68 0 0
32 8 9
17 0 0
38 10 11
43 0 0
9 12 13
48 0 0
8 14 15
85 0 0
6 16 17
30 0 0
92 18 19
37 0 0
78 20 21
33 0 0
70 22 23
85 0 0
72 24 25
31 0 0
17 26 27
33 0 0
47 28 29
25 0 0
83 30 31
28 0 0
49 32 33
15 0 0
88 34 35
29 0 0
78 36 37
98 0 0
50 38 39
89 0 0
83 40 41
3 0 0
15 42 43
15 0 0
51 44 45
3 0 0
60 46 47
1 0 0
78 48 49
66 0 0
78 50 0
71 0 0