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

namespace _3.SearchForANumber
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> numbers = Console.ReadLine().Split(' ').Select(int.Parse).ToList();
            var array = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
            List<int> listOperations = new List<int>();
            bool isTrue = false;
            for (int i = 0; i < array[0]; i++)
            {
                listOperations.Add(numbers[i]);
            }
            for (int i = 0; i < array[1]; i++)
            {
                listOperations.RemoveAt(0);
            }
            for (int i = 0; i < listOperations.Count; i++)
            {
                if (listOperations[i] == array[2])
                {
                    isTrue = true;
                }
            }
            if (isTrue == true)
            {
                Console.WriteLine("YES!");
            }
            else
            {
                Console.WriteLine("NO!");
            }
        }
    }
}