from sys import stdin
from collections import Counter
def main():
    #入力
    readline=stdin.readline
    n,x=map(int,readline().split())
    a=[int(readline()) for _ in range(n)]

    c=Counter(a)
    cnt=0
    if x==0:
        for v in c.values():
            cnt+=v*(v-1)//2
        print(cnt)
    else:
        for k in c.keys():
            b=k^x
            cnt+=c[b]*c[k]
        cnt//=2
        print(cnt)

if __name__=="__main__":
    main()