from collections import defaultdict
n, x = map(int, input().split())
a = [int(input()) for _ in range(n)]

ans = 0
if x == 0:
    c = defaultdict(int)
    for i in range(n):
        c[a[i]] += 1
    for i, m in c.items():
        ans += m*(m-1)//2
    print(ans)
else:
    c1 = defaultdict(int)
    c2 = defaultdict(int)
    for i in range(n):
        c1[a[i]] += 1
        c2[a[i]^x] += 1
    for i, m in c1.items():
        ans += m*c2[i]
    print(ans//2)