using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _3.Search_for_a_Number
{
    class Program
    {
        static void Main(string[] args)
        {
            var numbersList = Console.ReadLine().Split(' ').Select(int.Parse).ToList();
            var numbersArray = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
            bool check = true;

            for (int i = numbersArray[1]; i < numbersArray[0]; i++)
            {
                if (numbersList[i] == numbersArray[2])
                {
                    Console.WriteLine("YES!");
                    check = false;
                    break;
                }
            }
            if (check == true)
            {
                Console.WriteLine("NO!");
            }
        }
    }
}