import bisect
n,x=map(int,input().split())
a=sorted(list(map(int,input().split())))
ans=0
for i in range(n):
  v=x-a[i]
  if v<0:
    pass
  else:
    ans+=bisect.bisect_right(a,v)-bisect.bisect_left(a,v)
print(ans)