from bisect import *
N, X = map(int, input().split())
A = list(map(int, input().split()))
A.sort()
B = set(A)
ans = 0
for a in A:
    if X - a in B:
        pos1 = bisect_left(A, X - a)
        pos2 = bisect_right(A, X - a) - 1
        ans += pos2 - pos1 + 1
print(ans)