using System;
using System.Linq;

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

        int threeMs = 0;

        threeMs = N / 3;
        N %= 3;
        if (0 < N % 2)
        {
            threeMs -= 1;
            N += 3;
        }
        for (int i = 0; i < threeMs; i++) { Console.Write("7"); }
        for (int i = 0; i < N / 2; i++) { Console.Write("1"); }

        Console.WriteLine();
    }
}