using System;

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("Enter a year to calculate Orthodox Easter date:");
        int year = Convert.ToInt32(Console.ReadLine());

        DateTime easterDate = CalculateOrthodoxEaster(year);
        Console.WriteLine($"Orthodox Easter in {year} is on {easterDate.ToString("yyyy-MM-dd")}");
    }

    static DateTime CalculateOrthodoxEaster(int year)
    {
        int a = year % 4;
        int b = year % 7;
        int c = year % 19;
        int d = (19 * c + 15) % 30;
        int e = (2 * a + 4 * b - d + 34) % 7;
        int month = (d + e + 114) / 31;
        int day = ((d + e + 114) % 31) + 1;

        DateTime easterDate = new DateTime(year, month, day).AddDays(13); // Add 13 days to get the Orthodox Easter date

        return easterDate;
    }
}