def ri(): return int(input())
def rl(): return list(input().split())
def rli(): return list(map(int, input().split()))

def main():
    n, x = rli()
    lc = rli()
    mi = min(lc)
    ma = max(lc)
    if mi == x or ma == x:
        print("Yes")
        return
    if mi <= x and ma >= x:
        print("Yes")
        return
    print("No")

if __name__ == '__main__':
    main()