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Problem Statement

Naohiro had $N+1$ consecutive integers, one of each, but he lost one of them.

The remaining $N$ integers are given in arbitrary order as $A_1,…,A_N$. Find the lost integer.

The given input guarantees that the lost integer is uniquely determined.

Constraints

• $2 \le N \le 100$
• $1 \le A_i \le 1000$
• All input values are integers.
• The lost integer is uniquely determined.

Input

The input is given from Standard Input in the following format:

Output

Print the answer.

3
2 3 5

4

Naohiro originally had four integers, $2,3,4,5$, then lost $4$, and now has $2,3,5$.

Print the lost integer, $4$.

8
3 1 4 5 9 2 6 8

7

16
152 153 154 147 148 149 158 159 160 155 156 157 144 145 146 150

151