n, x = map(int, input().split())
A = list(map(int, input().split()))
d = {}
ans = 0
for a in A:
    if a not in d:
        d[a] = 1
    else:
        d[a] += 1
    if x-a in d:
        if a != x-a:
            ans += 2*d[x-a]
        else:
            ans += 2*d[x-a]-1
print(ans)