from collections import defaultdict
n,x = map(int,input().split())
a = [int(input()) for i in range(n)]

d = defaultdict(int)
#for i in range(n):
#    d[a[i]] += 1

ans = 0

for i in range(n):
    ans += d[a[i]^x]
    d[a[i]] += 1
print(ans)