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

B = {}
for a in A:
    if a in B:
        B[a] += 1
    else:
        B[a] = 1

count = 0
for key in B.keys():
    x = X - key
    if x in B:
        count += B[key] * B[x]

print(count)