using System;   
using System.Collections.Generic;
using System.Linq;
using System.Text;

class Program
{
    static void Main()
    {
        int N = int.Parse(Console.ReadLine());
        var num = Console.ReadLine().Trim().Split(' ');
        var number = Array.ConvertAll(num, int.Parse);

        Multi(N, number);
    }

    static void Multi(int N, int[] number)
    {
        string num = "987654321";
        var ans = "";

        Array.Reverse(number);
        for(int i = 0; i < 9; i++)
        {
            if (number[i] == 0) continue;
            {
                ans += new string(num[i], number[i]);
            }
        }
        Console.WriteLine(ans);
    }
}