Tung Tung Tung Sahur

sys.stdin = open("timkiem2.inp","r")

sys.stdout = open("timkiem2.out","w")

n,x = map(int,input().split())

a = list(map(int,input().split()))

def timkiem(a,n,x):

left = 0

right = n - 1

while left <= right:

mid = (left + right) // 2

if a[mid] == x:

return True

else if a[mid] < x:

left = mid + 1

else:

right = mid - 1

return False

a.sort()

print(timkiem(a,n,x))