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

class Magatro
{
    static void Main()
    {
        int N = int.Parse(Console.ReadLine());
        string ans = "";
        while (true)
        {
            if (N == 0)
            {
                break;
            }
            if (N == 3)
            {
                ans ="7"+ans;
                N -= 3;
            }
            else
            {
                N -= 2;
                ans+="1";
            }

        }
        Console.WriteLine(ans);
    }
}