from collections import defaultdict
import sys
input = sys.stdin.readline

N, P = map(int, input().split())
A = list(map(int, input().split()))
p = P
ans = 0
while p <= 10**10:
    cnt = defaultdict(int)
    for x in A:
        r = x % p
        ans += cnt[r]
        cnt[r] += 1
    p *= P
print(ans)