import sys
from collections import Counter
def input():
    return sys.stdin.readline()[:-1]
def main():
    N, X = map(int,input().split())
    A = [int(input()) for _ in range(N)]
    C = Counter(A)
    ans = 0
    for e in C:
        if e^X in C:
            ans += C[e]*C[e^X]
            C[e^X] = 0
    print(ans)
if __name__ == '__main__':
    main()