import sys
from collections import defaultdict
from typing import Generator, List, Tuple


def input(): return sys.stdin.readline().rstrip('\n')


def main():
    n, x = map(int, input().split())
    s = defaultdict(int)
    ans = 0
    for _ in range(n):
        a = int(input())
        ans += s[a ^ x]
        s[a] += 1
    return ans


if __name__ == '__main__':
    ret = main()


    def out(x):
        if isinstance(x, List) or isinstance(x, Tuple):
            print(*x)
        else:
            print(x)


    if ret is None:
        pass
    elif isinstance(ret, Generator):
        for val in ret:
            out(val)
    else:
        out(ret)