import sys

sys.setrecursionlimit(10 ** 8)

input = sys.stdin.readline


def main():
    N, X = [int(x) for x in input().split()]
    C = [int(x) for x in input().split()]

    if min(C) <= X <= max(C):
        print("Yes")
    else:
        print("No")

    
    

if __name__ == '__main__':
    main()