input:

1000000
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
...

output:

-1
-1
1
-1
-1
8
-1
-1
27
-1
-1
64
-1
-1
125
-1
-1
216
-1
-1
343
-1
-1
512
-1
-1
729
-1
-1
1000
-1
-1
1331
-1
-1
1728
-1
-1
2197
-1
-1
2744
-1
-1
3375
-1
-1
4096
-1
-1
4913
-1
-1
5832
-1
-1
6859
-1
-1
8000
-1
-1
9261
-1
-1
10648
-1
-1
12167
-1
-1
13824
-1
-1
15625
-1
-1
17576
-1
-1
19683
-1
-1
21952
...

result:

wrong answer 4th lines differ - expected: '2', found: '-1'