mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    N, X= map(int, input().split())
    C = list(map(int, input().split()))
    if min(C) <= X <= max(C):
        print("Yes")
    else:
        print("No")


if __name__ == '__main__':
    main()