def main():
    N, M, L = map(int, input().split())
    colors = list(map(int, input().split()))

    color_set = set((L,))

    for color in colors:
        if M in color_set:
            print("Yes")
            return

        new_color_set = {(now_color + color) // 2 for now_color in color_set}
        color_set.update(new_color_set)

    if M in color_set:
        print("Yes")
    else:
        print("No")


if __name__ == "__main__":
    main()