N, M = map(int, input().split())
A = list(map(int, input().split()))
if M & 1:
    print(0)
    exit()
SA = set(A)
cnt = 0
for i in range(N):
    if A[i] * 2 in SA:
        cnt += 1
    i += 1
print(cnt * (N - 2))