class Program
    {
        static void Main()
        {
            int n = int.Parse(Console.ReadLine());
            int[] position = Array.ConvertAll(Console.ReadLine().Split(' '), num => int.Parse(num.ToString()));
            if ((position[2] - position[0]) * (position[1] - position[0]) > 0)
            {
                Console.WriteLine("Yes");
            }
            else
            {
                Console.WriteLine("No");
            }
        }
    }