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Problem2109--ABC149C - Next Prime

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Time Limit : 1.000 sec Memory Limit : 128 MB

Find the minimum prime number greater than or equal to $X$ .

A prime number is an integer greater than

1

that cannot be evenly divided by any positive integer except

1

and itself.
For example,

2

3

, and

5

are prime numbers, while

4

and

6

are not.

Input is given from Standard Input in the following format:

$X$

Print the minimum prime number greater than or equal to

X