from bisect import bisect_left,bisect_right
N,X = map(int,input().split())
A = sorted([int(input()) for _ in range(N)])
ans = 0
for i in range(N):
    a = A[i]^X
    ind1 = bisect_left(A,a)
    ind2 = bisect_right(A,a)
    if X==0:
        ans += ind2 - ind1 - 1
    else:
        ans += ind2 - ind1
print(ans//2)