using System;

public class Test
{
	public static void Main()
{
	//5:00 -> RoundDown() -> 5:00
	//5:04 -> RoundDown() -> 5:00
	//5:09 -> RoundDown() -> 5:00
	//5:10 -> RoundDown() -> 5:10
	
	//4:00 -> RoundUp() -> 4:00
	//4:50 -> RoundUp() -> 4:50
	//4:51 -> RoundUp() -> 5:00
	//4:56 -> RoundUp() -> 5:00 
	
	Console.WriteLine(Round(new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, 5, 0, 0), 0));
	Console.WriteLine(Round(new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, 5, 4, 0), 0));
	Console.WriteLine(Round(new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, 5, 9, 0), 0));
	Console.WriteLine(Round(new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, 5, 10, 0), 0));
	Console.WriteLine(Round(new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, 4, 0, 0), 1));
	Console.WriteLine(Round(new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, 4, 50, 0), 1));
	Console.WriteLine(Round(new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, 4, 51, 0), 1));
	Console.WriteLine(Round(new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, 4, 56, 0), 1));
}

// Define other methods and classes here
public static DateTime Round(DateTime dt, int dir)
{
	// dir 1 = up, dir 0 = down
	DateTime t;
	if (dir == 1)
		t = dt.AddMinutes((60 - dt.Minute) % 10);
	else
		t = dt.AddMinutes(-dt.Minute % 10);
	return t;
}
}