题解 | #牛牛的二三七整除#

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        if(n % 2 == 0) {
            System.out.print(2 + " ");
        }
        if(n % 3 == 0) {
            System.out.print(3 + " ");
        } 
        if(n % 7 == 0) {
            System.out.println(7);
        }
        if(n % 2 != 0 && n % 3 != 0 && n % 7 != 0) {
            System.out.println("n");
        }
    }
}