Artur_3

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

count = 0
for i in range(n - 1):
    a_i = a[i]
    a_j = m - a_i
    if 0 <= a_j < a_i:
        count += a[i + 1:].count(a_j)

print(count)