n,x = map(int, input().split())
a = list(map(int, input().split()))
a.sort()

import bisect
ans=0
for i in range(n):
    now=a[i]
    nokori = x-now
    ind1 = bisect.bisect_left(a,nokori)
    ind2 = bisect.bisect_right(a,nokori)
    ans+=(ind2-ind1)

print(ans)