题解 | #扭蛋机#

using System;
using System.Linq;
using System.Collections.Generic;
public class Program
{
    public static void Main()
    {
        string line;
        int a = 0;
        string c = "";
        while ((line = System.Console.ReadLine()) != null&&line!="")
        { // 注意 while 处理多个 case
            a = Convert.ToInt32(line);
        }
       
            while (a != 1 && a != 0)
            {
                if (a % 2 == 0)
                {
                    c += "3";
                    a = (a - 2) / 2;

                }
                if (a % 2 == 1)
                {
                    c += "2";
                    a = (a - 1) / 2;
                }

            }

            if(a==1)
        {
            c += "2";
        }

       
        c = String.Join("", c.Reverse());
        Console.WriteLine(c);
    }
}