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(); StringBuilder sb=new StringBuilder(); while(a!=0){ if(a%2==0){ sb.insert(0,"3"); a=(a-2)/2; } else{ sb.insert(0,"2")...