import java.util.*;
import java.util.stream.Collectors;

public class SearchANumber {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        List<Integer> numList = new ArrayList<>();


        int[] inputNumbers = Arrays.stream(in.nextLine().split("\\s+"))
                .mapToInt(Integer::parseInt).toArray();

        int[] inputs = Arrays.stream(in.nextLine().split("\\s+")).mapToInt(Integer::parseInt).toArray();

        int numberElementsToTake = inputs[0];
        int numberElementsToDelete = inputs[1];
        int numberElementsToSearch = inputs[2];


        for (int i = 0; i < numberElementsToTake; i++) {
            numList.add(inputNumbers[i]);
        }


        for (int i = 0; i < numberElementsToDelete; i++) {
            if(numList.size()>0){
                numList.remove(0);
            }
        }


        if(numList.contains(numberElementsToSearch)){
            System.out.println("YES!");
        }else {
            System.out.println("NO!");
        }

    }
}