N, X = map(int, input().split())
a = list(map(int, input().split()))
l = [0] * 100001
for i in a:
    if 0 <= X - i < 100001:
        l[X - i] += 1
ans = 0
for i in a:
    if 0 <= i < 100001:
        ans += l[i]
print(ans)