N,X = map(int,input().split())

A = [int(input()) for _ in range(N)]
s = dict()
t = dict()
for i in A:
    if i in s:
        s[i] += 1
    else:
        s[i] = 1
    if i ^ X in t:
        t[i^X] += 1
    else:
        t[i^X] = 1
ans = 0
for i in s:
    if i in t:
        ans += s[i] * t[i]
if X == 0:
    print((ans - N) // 2)
else:
    print(ans // 2)