import sys
from collections import deque, Counter
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 63 - 1
mod = 998244353

n, p = mi()
A = li()

nowp = 1
ans = 0
for _ in range(60):
    nowp *= p
    if nowp > max(A):
        break
    a = Counter([v % nowp for v in A])
    for v, c in a.items():
        ans += c * (c - 1) // 2
print(ans)