import sys

readline = sys.stdin.readline

ns = lambda: readline().rstrip()
ni = lambda: int(readline().rstrip())
nm = lambda: map(int, readline().split())
nl = lambda: list(map(int, readline().split()))


def solve():
    n, x = nm()
    ans = 0
    d = dict()
    for _ in range(n):
        y = ni() 
        ans += d.get(x^y, 0)
        d[y] = d.get(y, 0) + 1
    print(ans)
    return

solve()