using System;

class IncreasingSequenceOfElements
{
    static void Main()
    {
        string[] inputArr = Console.ReadLine().Split(' ');
        int[] numbersArr = new int[inputArr.Length];
        int temp = 0;
        bool isIncresingSequence = false;


        for (int i = 0; i < numbersArr.Length; i++)
        {
            numbersArr[i] = int.Parse(inputArr[i]);

            isIncresingSequence = numbersArr[i] > temp;


            temp = numbersArr[i];
            if (isIncresingSequence == false)
            {
                break;
            }
        }
        if (isIncresingSequence)
        {
            Console.WriteLine("Yes");
        }
        else
        {
            Console.WriteLine("No");
        }

    }
}