1000 days after birth

using System;
using System.Globalization;

namespace _1000_days_after_birth
{
    class Program
    {
        static void Main()
        {
            string dateString = Console.ReadLine();
            string format = "dd-MM-yyyy";
            DateTime result = DateTime.ParseExact(dateString, format, null);
            DateTime ss = result.AddDays(999);
            string dd = ss.ToString("dd-MM-yyyy");
            Console.WriteLine(dd);
        }
    }
}