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

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            var matchNum = int.Parse(Console.ReadLine());
            var oneNum = matchNum / 2;
            var sevenFlag = matchNum % 2 == 1;
            var result = "";

            for(int i = 0; i < oneNum; i++)
            {
                result += "1";
            }

            if(sevenFlag)
            {
                result = result.Insert(0, "7");
                if(oneNum >= 1)
                {
                    result = result.Substring(0, result.Length - 1);
                }
            }

            Console.WriteLine(result);
        }
    }
}