n, x = map(int, input().split())
a = []
for _ in range(n):
  a.append(int(input()))
a = sorted(a)
b = sorted([i ^ x for i in a])
i = j = c = 0
while i < n and j < n:
    if a[i] < b[j]:
        i += 1
    elif a[i] > b[j]:
        j += 1
    else:
        i0 = i
        while i < n and a[i] == a[i0]:
            i += 1
        j0 = j
        while j < n and b[j] == b[j0]:
            j += 1
        c += (i - i0) * (j - j0 - (x == 0))
print(c // 2)