import sys
input = lambda : sys.stdin.readline().rstrip()

sys.setrecursionlimit(2*10**5+10)
write = lambda x: sys.stdout.write(x+"\n")

n,x = list(map(int, input().split()))
c = list(map(int, input().split()))
if min(c)<=x<=max(c):
    print("Yes")
else:
    print("No")