2233娘扭蛋机

import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int x = sc.nextInt();
        StringBuilder sb = new StringBuilder();
        while(true){//从最后一步往前逆推。正推时，每次都是用了上一次所有的蛋翻番。
            if(x == 1){
                sb.append("2");
                break;
            }else if(x == 2) {
                sb.append("3");
                break;
            }else if(x%2 == 0){
                sb.append("3");
                x = (x - 2)/2;
            }else if(x%2 == 1){
                sb.append("2");
                x = (x - 1)/2;
            }
        }
        sb = sb.reverse();
        System.out.println(sb);
    }
}