import collections
N, X = map(int,input().split())
A = list(map(int,input().split()))
C = collections.Counter(A)
ans = 0
for i in range(10 ** 5 + 1):
    if X == 2 * i:
        ans += C[i] ** 2
    else:
        ans += C[i]* C[X - i]
print(ans)