

import java.util.Scanner;

public class Main {
    static Scanner sc = new Scanner(System.in);

    public static void main(String[] args) {
        int x = sc.nextInt();
        boolean answer = false;
        outside:
        while (!answer) {
            for (int i = 2; i < x; i++) {
                if (x % i == 0) {
                    x++;
                    continue outside;
                }
            }
            answer = true;
        }
        System.out.println(x);
    }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz