from collections import Counter
n, p = map(int, input().split())
a = list(map(int, input().split()))
amx = max(a)
pk = p
ans = 0
while pk <= amx:
    c = Counter()
    for x in a:
        r = x % pk
        ans += c[r]
        c[r] += 1
    pk *= p
print(ans)