N,X = map(int,input().split())
A = [int(input()) for _ in range(N)]
mapA = {}
B = []
ans = 0
for a in A:
    if a in mapA:
        mapA[a] += 1
    else:
        mapA[a] = 1
    B.append(a^X)
for b in B:
    if b in mapA:
        ans += mapA[b]
print(ans//2)