N,X = map(int,input().split())
A = list(map(int,input().split()))
cnt = 0
for i in range(N):
    for j in range(i,N):
        if A[i] + A[j] == X and A[i] != A[j]:
            cnt += 2
        elif A[i] + A[j] == X and A[i] == A[j]:
            cnt += 1
print(cnt)