mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    N, X = map(int, input().split())
    dic = {}
    for _ in range(N):
        a = int(input())
        if a in dic:
            dic[a] += 1
        else:
            dic[a] = 1
    ans = 0
    if X == 0:
        for a in dic:
            v = dic[a]
            ans += v * (v-1) // 2
    else:
        for a in dic:
            b = X ^ a
            if b in dic:
                ans += dic[a] * dic[b]
        ans //= 2
    print(ans)


if __name__ == '__main__':
    main()