Sevenland

using System;


class Program
{
    static void Main(string[] args)
    {

            string K = Console.ReadLine();
            int num = Convert.ToInt32(K);

            bool found = false;
            do
            {
                num = Convert.ToInt32(K);
                num++;
                K = Convert.ToString(num);
                if (K.Contains("7") || K.Contains("8") || K.Contains("9"))
                {
                    num = Convert.ToInt32(K);
                    num++;

                }
                else
                {
                    num = Convert.ToInt32(K);
                    found = true;

                }


            } while (found == false);

            Console.WriteLine(num);



    }
}