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Time limit 2000/4000/4000/4000 ms. Memory limit 65000/65000/65000/65000 Kb.
Difficulty Alpha
You are given all numbers between 1,2,…,n except one. Your task is to find the missing number.
Input
The first input line contains an integer n.
The second line contains n−1 numbers. Each number is distinct and between 1 and n (inclusive).
Output
Print the missing number.
Constraints
2≤n≤2⋅105
Example
Input:
5
2 3 1 5
Output:
4
Для отправки решений необходимо выполнить вход.
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