import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int x = sc.nextInt();
        int max = 0;
        int min = Integer.MAX_VALUE;
        for (int i = 0; i < n; i++) {
            int y = sc.nextInt();
            max = Math.max(max, y);
            min = Math.min(min, y);
        }
        if (max >= x && min <= x) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }
}