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

namespace SearchForANumber
{
    class Program
    {
        static void Main(string[] args)
        {
            var numbers = Console.ReadLine()
                          .Split(' ')
                          .Select(int.Parse)
                          .ToList();

            var commandArgs = Console.ReadLine()
                         .Split(' ')
                         .Select(int.Parse)
                         .ToList();

            var result = numbers.Take(commandArgs[0]).ToList();

            result.RemoveRange(0, commandArgs[1]);

            if (result.Contains(commandArgs[2]))
            {
                Console.WriteLine("YES!");
            }
            else
            {
                Console.WriteLine("NO!");
            }
        }
    }
}