/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    public static void main (String[] args) throws java.lang.Exception
    {
        // your code goes here
        int n = 201;
        while (true)
        {
            boolean b = true;
            for (int i = 2; i < n / 2; i++)
            {
                if (n % i == 0) b = false;
            }
            if (b) break;
            n++;
        }
        System.out.println(n);
    }
}

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