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

public class yukicoder
{

    public static string match(int n)
    {
        if(n == 0)
        {
            return "";
        }
        
        System.Text.StringBuilder sb = new System.Text.StringBuilder();
        
        for (int i = 1; i <= n / 2; i++)
        {
            sb.Append("1");
        }

        return sb.ToString();
    }

    public static void Main()
    {
       int a = int.Parse(Console.ReadLine());

       if(a % 2 == 0)
       {
           Console.WriteLine(match(a));
       }
       else
       {
           Console.WriteLine("7" + match(a - 3));
       }
       
    }
}