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
    if X != 0:
        for e in C:
            if e^X in C:
                ans += C[e]*C[e^X]
                C[e^X] = 0
    else:
        for e in C:
            ans += (C[e]*(C[e]-1))//2
    print(ans)
if __name__ == '__main__':
    main()