using System;

class Program {
    static void Main(string[] args) {
        if (!int.TryParse(Console.ReadLine(), out var input))
            return;
        
        string output;
        if (input < 2) {
            output = "0";
        }
        else if (input % 2 == 0) {
            output = new string('1', input / 2);
        }
        else {
            output = "7" + new string('1', (input - 3) / 2);
        }

        Console.WriteLine(output);
    }
}