import sys
import collections

sys.setrecursionlimit(10 ** 8)

input = sys.stdin.readline


def main():
    N, X = [int(x) for x in input().split()]
    A = [int(input()) for _ in range(N)]

    c = collections.Counter(A)

    ans = 0
    for a in A:
        ans += c[a ^ X]

    print(ans // 2)
    
    
    
    

if __name__ == '__main__':
    main()