from collections import defaultdict

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

ans = 0
pow_p = p
while pow_p < max(A) + 10:
    M = defaultdict(int)
    for i in range(n):
        ans += M[A[i] % pow_p]
        M[A[i] % pow_p] += 1
    pow_p *= p
print(ans)