N, X = map(int, input().split())
a = list(map(int, input().split()))

b = {}
for ai in a:
    if ai not in b:
        b[ai] = 1
    else:
        b[ai] += 1

ans = 0
for k in b:
    if X - k in b:
        ans += b[k] * b[X - k]

print(ans)