n, P = map(int, input().split())
A = list(map(int, input().split()))
x = P
ans = 0
while x < max(A):
    cnt = {}
    for a in A:
        b = a % x
        ans += cnt.get(b, 0)
        cnt[b] = cnt.get(b, 0) + 1
    x *= P

print(ans)