using System;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        int N = int.Parse(Console.ReadLine());
        string ans = "";

        while (true)
        {
            if (N == 0)
            {
                break;
            }

            if (N == 3)
            {
                ans = "7" + ans;
                N -= 3;
            }
            else
            {
                ans += "1";
                N -= 2;
            }
        }

        Console.WriteLine(ans);
    }
}