import sys
sys.setrecursionlimit(5*10**5)
input = sys.stdin.readline
from collections import defaultdict, deque, Counter
from heapq import heappop, heappush
from bisect import bisect_left, bisect_right
from math import gcd

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


ans = 0
for i in range(1,60):
    d = defaultdict(int)
    now = pow(p,i)
    for i in range(n):
        ans += d[a[i] % now]
        d[a[i] % now] += 1
    
print(ans)