from collections import defaultdict

INF = 10 ** 9

n, p = map(int, input().split())
a = list(map(int, input().split()))

cnt = [defaultdict(int) for _ in range(31)]
ans = 0
for i in range(n):
  cur = 1
  for j in range(1, 31):
    cur *= p
    if cur > INF:
      break

    ans += cnt[j][a[i] % cur]
    cnt[j][a[i] % cur] += 1

print(ans)