题解 | #牛牛的二三七整除#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
            int a = in.nextInt();
            if(a % 2 * a % 3 *a % 7 == 0){
                if(a % 2 == 0){
                    System.out.print(2 +" ");
                }if(a % 3 == 0){
                    System.out.print(3 + " ");
                }if(a % 7 == 0){
                    System.out.print(7);
                }
            }else{
                System.out.println("n");
            }

        
    }
}