n, x = map(int, input().split())
a = list(map(int, input().split()))
count = {}
for i in a:
    if i in count:
        count[i] += 1
    else:
        count[i] = 1

l = []

for key in count:
    if x-key in count and not key in l and not x-key in l:
        l.append(key)

ans = 0
for i in l:
    ans += count[i]*count[x-i]*(2 if i != x-i else 1)

print(ans)