Missing Number

Submit

Language is selected by the extension of the file. See the list of supported languages to know the extension of your language.

Problem

Find the missing number.

Options

exec is denied

rejudge feature is enabled

now post-mortem time, all source codes will be revealed

Sample input:_

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100

Sample output:

40

Sample input:_

1
2
3
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5
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9
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100

Sample output:

56

Sample input:_

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
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25
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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
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68
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71
72
73
74
75
76
77
79
80
81
82
83
84
85
86
87
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89
90
91
92
93
94
95
96
97
98
99
100

Sample output:

78

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