n, x = map(int, input().split())
A = list(map(int, input().split()))

dict = {}

for a in A:
    if x - a not in dict:
        dict[x - a] = 1
    else:
        dict[x - a] += 1

cnt = 0
for a in A:
    if a in dict:
        cnt += dict[a]

print(cnt)