n,x = map(int,input().split())
a = list(map(int,input().split()))
a = sorted(a)
import collections
c = collections.Counter(a)
e = c.most_common()
ans = 0
for i in range(len(e)):
  b = e[i][0]
  d = x-b
  k = c[d]
  ans += e[i][1] * k
print(ans)