
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		while(true) {
			int cnt = 0;
			for (int i = 2; i < n; i++) {
				if (n % i == 0) {
					cnt++;
					break;
				}
			}
			
			if (cnt >= 1) {
				n++;
				continue;
			} else {
				break;
			}
		}
		
		System.out.println(n);
		
	}
}

/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