import sys

sys.setrecursionlimit(10 ** 7)
input = sys.stdin.readline
f_inf = float('inf')
mod = 10 ** 9 + 7


def resolve():
    n, x = map(int, input().split())
    C = list(map(int, input().split()))

    max_c = max(C)
    min_c = min(C)
    if min_c <= x <= max_c:
        print("Yes")
    else:
        print("No")


if __name__ == '__main__':
    resolve()