using System.Numerics;

public class Program
{
    public static void Main()
    {

        int num = int.Parse(Console.ReadLine() ?? string.Empty);
        //string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        //string str = Console.ReadLine() ?? string.Empty;

        if(num <= 100)
        {
            Console.WriteLine("Milk");
        }
        else
        {
            Console.WriteLine("Difficult");
        }


    }

}