import sys
import math
stdin=sys.stdin

ip=lambda: int(sp())
fp=lambda: float(sp())
lp=lambda:list(map(int,stdin.readline().split()))
sp=lambda:stdin.readline().rstrip()
Yp=lambda:print('Yes')
Np=lambda:print('No')

n, x = lp()
c = lp()
a = min(c)
b = max(c)
if a <= x <= b:
    Yp()
else:
    Np()