using System;
public class Program
{
public static void Main()
//int timeNow = DateTime.Now.Hour;
int timeNow = 6;
string hi = "";
if ((timeNow >= 6) & (timeNow <= 12))
hi = "Доброе утро, ";
else if ((timeNow >= 12) & (timeNow <= 18))
hi = "Добрый день, ";
else hi = "Добрый вечер, ";
Console.WriteLine(hi);
}