N, X = map(int, input().split())
LX = [0 for _ in range(32)]
for i in range(32):
    LX[i] = X % 2
    X //= 2
A = [0 for i in range(N)]
B = [0 for i in range(N)]
for i in range(N):
    a = int(input())
    A[i] = a
    bas = 1
    for j in range(32):
        B[i] += ((a % 2) + LX[j] - 2 * (a % 2) * LX[j]) * bas
        a //= 2
        bas *= 2
D = {}
cnt = 0
for i in range(N):
    if B[i] in D:
        D[B[i]] += 1
    else:
        D[B[i]] = 1
for i in range(N):
    if A[i] in D:
        cnt += D[A[i]]
print(cnt // 2)