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

namespace kiváló_szám
{
    internal class Program
    {
        static int Beolvas()
        {
            string sor = Console.ReadLine();
            int N = int.Parse(sor);
            return N;
        }
        static int Feldolgoz(int N)
        {
            if (N == 1)
            {
                Console.Write("-1");
            }
            if (N % 2 == 0)
            {
                for(int i = 0; i < N/2; i++)
                {
                    Console.Write("15");
                }
            }
            else
            {
                for (int i = 0; i < (N-3)/2; i++)
                {
                    Console.Write("15");
                }
                Console.WriteLine("111");
            }
            return N;
            
        }
        static void Main(string[] args)
        {
            int N = Beolvas();
            Feldolgoz(N);
        }
    }
}