from collections import Counter

N, X = map(int, input().split())
A = Counter(int(input()) for _ in range(N))
ans = 0

if X == 0:
    print(sum(v * (v - 1) // 2 for v in A.values()))
    exit()

for k, v in A.items():
    ans += v * A[k ^ X]
print(ans // 2)